Change maintainer email from cvs-ghc@haskell.org to ghc-devs@haskell.org
As discussed in #22142 (closed), the maintainer email was adjusted from cvs-ghc@haskell.org which seems to have been only briefly used, to ghc-devs@haskell.org.
The mentions of that mailing list in the issue still exist within ghc in atleast (if I grepped correctly) four places. I don't know if an archive of that exists and can be recovered.
Fixes #22142 (closed)