test(mix): use real packages and versions

[sheerlox]

Changes

Updated the mix.exs and mix.lock files to be closer to reality by using actual packages and versions.

No change in behavior.

Context

This makes using mix deps.get possible (note: because they are organization packages, it's still necessary to comment the private secret and another_secret deps, and add back their rows in mix.lock afterward).

This has two benefits:

• gets the fixture closer to a real-world example, since it's now processable by mix;
• eases adding dependencies for developers working on the manager, leaving less room for mistakes and further solidifying the previous point.

As to why: I'm working on adding depType support to this manager because it being missing has been the biggest pain in using Renovate in my Elixir projects. Needed to add a few deps for the tests, and found the situation of those two files. Decided that was a good time investment before going through the depType thing.

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please select one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

[renovate-release]

🎉 This PR is included in version 39.83.5 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)
• 39.83.5

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