Update checkout action to v5

[mcbarton]

Description

Please include a summary of changes, motivation and context for this PR.

Fixes # (issue)

Type of change

Please tick all options which are relevant.

• Bug fix
• New feature
• Requires documentation updates

Testing

Please describe the test(s) that you added and ran to verify your changes.

Checklist

• I have read the contribution guide recently

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.73%. Comparing base (d6ffc84) to head (9f482bf).
⚠️ Report is 27 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #703   +/-   ##
=======================================
  Coverage   79.73%   79.73%           
=======================================
  Files           9        9           
  Lines        3953     3953           
=======================================
  Hits         3152     3152           
  Misses        801      801           

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[vgvassilev]

LGTM!