As discussed at https://github.community/t5/GitHub-Actions/Possible-to-turn-off-error-matchers/td-p/31070 how can we get rid of these confusing messages?

There is a message in https://github.com/ddelange/pipgrip/commit/74f5a858bd535a90f48e5486dad7cbc0472daa7c/checks?check_suite_id=393749770 that says:

Run actions/setup-python@v1
Added matchers: 'python'. Problem matchers scan action output for known warning or
error strings and report these inline.

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