Bump actions/checkout to v6

[dfed]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.84%. Comparing base (e109a22) to head (f561f71).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #192      +/-   ##
==========================================
- Coverage   99.90%   99.84%   -0.07%     
==========================================
  Files          32       32              
  Lines        3264     3264              
==========================================
- Hits         3261     3259       -2     
- Misses          3        5       +2     

see 1 file with indirect coverage changes

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