Update core workflow actions to df4cb1c

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout (changelog)	action	digest	de0fac2 → df4cb1c

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.13%. Comparing base (4a9af53) to head (0d6eb5e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5461      +/-   ##
==========================================
- Coverage   69.15%   69.13%   -0.02%     
==========================================
  Files         634      634              
  Lines       64473    64473              
==========================================
- Hits        44585    44573      -12     
- Misses      16586    16599      +13     
+ Partials     3302     3301       -1     

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