Fix the lint error. While at it, change the wording so it's clear it's
looking in pmaports instead of aports, use '' around the source package
just as the message does about the pkgname_depend, remove <> from the
link URL.
New message:
Could not find dependency 'so:libPocoData.so.80' in checked out pmaports dir or any APKINDEX. Required by 'nymphcast'. See: https://postmarketos.org/depends
Fixes: 81dc4c ("pmb.parse: show which package require the missing package")