Move sortedcontainers to install_requires

[eivindjahren]

It is required for a working system now.

Pre review checklist

• Read through the code changes carefully after finishing work
• Make sure tests pass locally (after every commit!)
• Prepare changes in small commits for more convenient review (optional)
• PR title captures the intent of the changes, and is fitting for release notes.
• Updated documentation
• Ensured that unit tests are added for all new behavior (See
  Ground Rules),
  and changes to existing code have good test coverage.

Pre merge checklist

• Added appropriate release note label
• Commit history is consistent and clean, in line with the contribution guidelines.

[codecov-commenter]

Codecov Report

Merging #6115 (ae708c4) into main (1d153e7) will increase coverage by 16.79%.
Report is 11 commits behind head on main.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main    #6115       +/-   ##
===========================================
+ Coverage   65.65%   82.45%   +16.79%     
===========================================
  Files         349      350        +1     
  Lines       21481    21442       -39     
  Branches      813      834       +21     
===========================================
+ Hits        14104    17680     +3576     
+ Misses       7084     3464     -3620     
- Partials      293      298        +5     

see 134 files with indirect coverage changes

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[yngve-sk]

🚀