(Closes #2835) Test reverting to 22.04 for tests

[LonelyCat124]

Tests seem to be failing with 3.7 now, testing if reverting to ubuntu 22.04 fixes this for now.

[LonelyCat124]

@arporter Small fix to the GHA to ensure we can still support 3.7. Ready to review. I've added an issue to revert this later as well.

[arporter]

Thanks very much for doing this and top marks for adding the TODO! Please could you do the same trick for the link-checking action as that too is failing with an error that looks like it's caused by using a more recent Ubuntu. Alternatively, maybe there's a better fix? There may be a new release of the linkcheck action?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.88%. Comparing base (d6dc2bd) to head (398c1a3).
Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2836   +/-   ##
=======================================
  Coverage   99.88%   99.88%           
=======================================
  Files         359      359           
  Lines       50258    50258           
=======================================
  Hits        50202    50202           
  Misses         56       56           

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[LonelyCat124]

@arporter You were right, same issue with linkspector. I've added a separate TODO (2838) for linkspector, and link to an issue open on linkspector that other people have posted.

Edit: Their latest release claims to havse fixed the issue but doesn't seem to for us.

[arporter]

Thanks very much for fixing this Aidan.
Changes are confined to GHA yml files and are marked with TODOs. No need to re-run integration tests.
Will proceed to merge.