Update CodeCov keybase url (backport #9327)

[mergify]

Our CodeCov upload stopped working because of this change: https://github.com/codecov/codecov-action/releases/tag/v7.0.0

---

This is an automatic backport of pull request #9327 done by Mergify.

[mergify]

Cherry-pick of f97dedb has failed:

On branch mergify/bp/0.28.x/pr-9327
Your branch is up to date with 'origin/0.28.x'.

You are currently cherry-picking commit f97dedb6.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   .github/workflows/on_PR_linux_special_builds.yml

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   .github/workflows/on_push_ExtraJobsForMain.yml

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[mergify]

Tick the box to add this pull request to the merge queue (same as @mergifyio queue).

• Queue this pull request

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.55%. Comparing base (c798e33) to head (02628cd).
⚠️ Report is 25 commits behind head on 0.28.x.

Additional details and impacted files

@@           Coverage Diff           @@
##           0.28.x    #9348   +/-   ##
=======================================
  Coverage   65.55%   65.55%           
=======================================
  Files         104      104           
  Lines       22293    22295    +2     
  Branches    10901    10903    +2     
=======================================
+ Hits        14614    14616    +2     
  Misses       5355     5355           
  Partials     2324     2324           

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