Fix "yapf not found" in PR #3

[AlexanderMelde]

see #3 for details, unfortunately i dont't have the time to investigate further into it currently, so @WildCard65 if you want to fix the bug, please send a new pull request if you have resolved the issue 👍

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[AlexanderMelde]

@WildCard65 i have invited you to the test-repository i used, if you want you can play around there and maybe we can get it working. I also saved your changes in the composite-action branch of this repo

[WildCard65]

I'll get to it when I get home.