replace blockdiag with graphviz in docs

[Cycloctane]

What do these changes do?

• replace blockdiag with graphviz in docs/tracing_reference.rst
• remove sphinxcontrib-blockdiag dependency in requirements

Are there changes in behavior for the user?

Is it a substantial burden for the maintainers to support this?

Related issue number

Fixes #9134

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• If you provide code modification, please add yourself to CONTRIBUTORS.txt
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  • Please keep alphabetical order, the file is sorted by names.
• Add a new news fragment into the CHANGES/ folder

  • name it <issue_or_pr_num>.<type>.rst (e.g. 588.bugfix.rst)

  • if you don't have an issue number, change it to the pull request
    number after creating the PR

    • .bugfix: A bug fix for something the maintainers deemed an
      improper undesired behavior that got corrected to match
      pre-agreed expectations.
    • .feature: A new behavior, public APIs. That sort of stuff.
    • .deprecation: A declaration of future API removals and breaking
      changes in behavior.
    • .breaking: When something public is removed in a breaking way.
      Could be deprecated in an earlier release.
    • .doc: Notable updates to the documentation structure or build
      process.
    • .packaging: Notes for downstreams about unobvious side effects
      and tooling. Changes in the test invocation considerations and
      runtime assumptions.
    • .contrib: Stuff that affects the contributor experience. e.g.
      Running tests, building the docs, setting up the development
      environment.
    • .misc: Changes that are hard to assign to any of the above
      categories.

  • Make sure to use full sentences with correct case and punctuation,
    for example:

    Fixed issue with non-ascii contents in doctest text files
    -- by :user:`contributor-gh-handle`.

    Use the past tense or the present tense a non-imperative mood,
    referring to what's changed compared to the last released version
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.56%. Comparing base (2628256) to head (7615b50).
Report is 7 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #9359   +/-   ##
=======================================
  Coverage   98.56%   98.56%           
=======================================
  Files         107      107           
  Lines       34949    34981   +32     
  Branches     4139     4149   +10     
=======================================
+ Hits        34446    34478   +32     
  Misses        335      335           
  Partials      168      168           

Flag	Coverage Δ
CI-GHA	98.44% <ø> (+<0.01%)	⬆️
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OS-macOS	97.79% <ø> (-0.01%)	⬇️
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Py-3.10.15	97.60% <ø> (-0.01%)	⬇️
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VM-windows	96.51% <ø> (+<0.01%)	⬆️

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[Cycloctane]

Note that GraphViz requires additonal packages to be installed to render diagrams when building documentation. This change haven't been presented yet.

[Dreamsorcerer]

If you follow the link from the RTD job in the PR (https://aiohttp--9359.org.readthedocs.build/en/9359/tracing_reference.html) you can preview the docs. Currently, there are no diagrams rendered.

[Dreamsorcerer]

If you follow the link from the RTD job in the PR (https://aiohttp--9359.org.readthedocs.build/en/9359/tracing_reference.html) you can preview the docs. Currently, there are no diagrams rendered.

I'm guessing that might be because of your comment about needing another package, though I'm a little surprised the build doesn't fail if a dependency is missing...

[Cycloctane]

If you follow the link from the RTD job in the PR (https://aiohttp--9359.org.readthedocs.build/en/9359/tracing_reference.html) you can preview the docs. Currently, there are no diagrams rendered.

I'm guessing that might be because of your comment about needing another package, though I'm a little surprised the build doesn't fail if a dependency is missing...

I've added the dependency package to .readthedocs.yml. Now it seems to be working.

[Dreamsorcerer]

I think that works well enough. Thanks for that.

[patchback]

Backport to 3.11: 💔 cherry-picking failed — conflicts found

❌ Failed to cleanly apply a9ac5e2 on top of patchback/backports/3.11/a9ac5e218869ae58e72867ec493ad1af6a9f31e8/pr-9359

Backporting merged PR #9359 into master

1. Ensure you have a local repo clone of your fork. Unless you cloned it
   from the upstream, this would be your origin remote.
2. Make sure you have an upstream repo added as a remote too. In these
   instructions you'll refer to it by the name upstream. If you don't
   have it, here's how you can add it:

   $ git remote add upstream https://github.com/aio-libs/aiohttp.git

3. Ensure you have the latest copy of upstream and prepare a branch
   that will hold the backported code:

   $ git fetch upstream
   $ git checkout -b patchback/backports/3.11/a9ac5e218869ae58e72867ec493ad1af6a9f31e8/pr-9359 upstream/3.11

4. Now, cherry-pick PR replace blockdiag with graphviz in docs #9359 contents into that branch:

   $ git cherry-pick -x a9ac5e218869ae58e72867ec493ad1af6a9f31e8

   If it'll yell at you with something like fatal: Commit a9ac5e218869ae58e72867ec493ad1af6a9f31e8 is a merge but no -m option was given., add -m 1 as follows instead:

   $ git cherry-pick -m1 -x a9ac5e218869ae58e72867ec493ad1af6a9f31e8

5. At this point, you'll probably encounter some merge conflicts. You must
   resolve them in to preserve the patch from PR replace blockdiag with graphviz in docs #9359 as close to the
   original as possible.
6. Push this branch to your fork on GitHub:

   $ git push origin patchback/backports/3.11/a9ac5e218869ae58e72867ec493ad1af6a9f31e8/pr-9359

7. Create a PR, ensure that the CI is green. If it's not — update it so that
   the tests and any other checks pass. This is it!
   Now relax and wait for the maintainers to process your pull request
   when they have some cycles to do reviews. Don't worry — they'll tell you if
   any improvements are necessary when the time comes!

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.

[Dreamsorcerer]

Could you handle the backport as well?