Dear Maintainer,

ranger has a new homepage, https://ranger.fm

and it is linked from the old git repository https://github.com/ranger/ranger

The d/watch file was refreshed accordingly, and updated from version 4
to version 5. The d/control file also has the new homepage now.

While I was at it, I also took the opportunity to remove the obsolete
control fields "Priority: optional" "Rules-Requires-Root: no" because
they are now default.

Additionally I refreshed the PGP signing keys because they were expired.