Remove Alpine's maintainers and contributors from the APKBUILDs in temp
where we still had them. In general, we don't keep them there, because
we don't want them to get e-mailed about questions from the postmarketOS
aports. It is obvious that they were copy pasted from Alpine, with minor
adjustments.
Remove "Remember to increase pkgrel after changing _pkgver!" from
temp/mesa, because we have a CI check for that now.
[ci:skip-build]: cosmetic changes only
77a57de7ed