[issue39777] Use the codecov GH Action

[Ammar Askar]

Ammar Askar <ammar at ammaraskar.com> added the comment:

On a second look, we currently do this anyway: https://github.com/python/cpython/blob/374d998b507d34a6c0a3816a163926a8ba0c483f/.github/workflows/coverage.yml#L66-L70

and don't run coverage for PRs so it shouldn't matter.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39777>
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