CI uses ubuntu-22.04

[keiravillekode]

No description provided.

[IsaacG]

This should be reviewed by @exercism/fsharp (Erik). No need for the guardians.

[keiravillekode]

Context: https://forum.exercism.org/t/updating-workflows-from-ubuntu-20-04/16884
Closing as my attempts fail with

#36 [runtime 5/5] COPY bin/ bin/
#36 CACHED
WARNING: No output specified with docker-container driver. Build result will only remain in the build cache. To push result image into registry use --push or to load image into docker use --load
[2025-06-02 21:01:35Z] Running test runner for 'AllTestsWithTask' solution...
Unhandled exception. System.IO.DirectoryNotFoundException: Could not find a part of the path '/opt/test-runner/tests/AllTestsWithTask/TestResults/tests.trx'.