Bug report

Bug description:

If more than one PR is opened from branches with the same name, CI testing fails due to mandatory tests being canceled. This is due to the way concurrency groups are named; there is a PR coming with a fix.

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

Linked PRs

• gh-134309: Fix premature cancellation of CI tests when multiple PRs have the same branch name #134310
• [3.14] gh-134309: Add github.actor to the GitHub Actions concurrency key (GH-134310) #134484
• [3.13] gh-134309: Add github.actor to the GitHub Actions concurrency key (GH-134310) #134485