[1.26] Fix running CPython 2.7 tests in CI #3137
Merged
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Fixes #3077
actions/setup-python dropped support for CPython 2.7.
Since we still need to run tests using the version, CI starts to use Ubuntu's CPython 2.7 version.
Unfortunately, testing using CPython 2.7 on macOS and Windows is dropped by this PR.
This PR is based on #3136 to display the tests passing.