tree-wide: fix incorrect url variables
These were found by running the following on a fresh aports clone:
grep -rnI . -e '^url=' | grep -Ev '.git/|(https|http|gopher|ftp)://'
Confirmation was done using https://pkgs.alpinelinux.org/packages as the project URL for any of these packages could not be followed from the website.
Feel free to suggest a better commit message! I didn't want to split this into separate community/*
and testing/py3-padaos
commits but I certainly can if that's how it should be done.