MR4: Re-enable lang upgrades after on-sync period (5.1)

[mihailges]

Part of the 5.1 release process. This will be merged after the on-sync period.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.56%. Comparing base (269c39f) to head (61c6622).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #160      +/-   ##
==========================================
- Coverage   63.15%   61.56%   -1.59%     
==========================================
  Files          51       51              
  Lines        1699     1699              
==========================================
- Hits         1073     1046      -27     
- Misses        626      653      +27     

Flag	Coverage Δ
behat_bisect_test	40.32% <0.00%> (ø)
behat_test	40.73% <0.00%> (ø)
phpunit_bisect_test	34.18% <0.00%> (ø)
phpunit_test	?
postjobs_test	32.93% <0.00%> (ø)
runner_test	15.89% <0.00%> (ø)

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