[PSA] Please check your github email configuration when merging on Github

[Aljoscha Krettek-2]

Hi Everyone,

we have a lot of commits recently that were committed by "GitHub
<[hidden email]>". This happens when your GitHub account is not
configured correctly with respect to your email address. Please make
sure that your commits somehow show who is the committer.

For reference, check out
https://help.github.com/en/github/collaborating-with-issues-and-pull-requests/merging-a-pull-request.
Especially point 5.

Best,
Aljoscha