build: update codecov action version

[pomegranited]

cf https://discuss.openedx.org/t/codecov-upload-breakages/12877, openedx/axim-engineering#1125

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[kdmccormick]

closing/opening to see if codecov works now (openedx/axim-engineering#1125)

[kdmccormick]

Just a suggestion to run Coverage with the latest python, looks good otherwise!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.33%. Comparing base (5273df1) to head (1eb1bad).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #241      +/-   ##
==========================================
- Coverage   93.43%   92.33%   -1.11%     
==========================================
  Files          18       18              
  Lines        1995     1995              
  Branches      130      268     +138     
==========================================
- Hits         1864     1842      -22     
  Misses        118      118              
- Partials       13       35      +22     

Flag	Coverage Δ
unittests	92.33% <ø> (-1.11%)	⬇️

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[pomegranited]

Since this is just a CI change, the coverage diff failure can be ignored.

[openedx-webhooks]

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