Bump codecov-action to v5 (Node.js 24 support)

[saitcakmak]

Summary

codecov/codecov-action@v4 runs on the deprecated Node.js 20 runtime, which triggers a CI warning:

Node.js 20 actions are deprecated. ... Actions will be forced to run with Node.js 24 by default starting June 16th, 2026.

This bumps the action to v5, which runs on Node.js 24.

Details

• Only change is .github/workflows/reusable_test.yml: codecov/codecov-action@v4 → @v5.
• The inputs used (token, files, fail_ci_if_error) remain valid in v5, so no other changes are required.

Test plan

• Coverage upload step runs on the next CI run (Linux, Python 3.11) and should no longer emit the Node.js 20 deprecation warning.

[meta-codesync]

@saitcakmak has imported this pull request. If you are a Meta employee, you can view this in D107386990.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.98%. Comparing base (5e7b3ac) to head (45f1595).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3315   +/-   ##
=======================================
  Coverage   99.98%   99.98%           
=======================================
  Files         226      226           
  Lines       22470    22470           
=======================================
  Hits        22466    22466           
  Misses          4        4           

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[meta-codesync]

@saitcakmak merged this pull request in 7a5692d.