Treewide: update some problematic homepages

These URLs are reported as problematic by Repology.
It could be a permanent redirection
or the page does not exist anymore

pkgs/development/python-modules/extras/default.nix

@@ -16,8 +16,8 @@ buildPythonPackage rec {
   doCheck = false;
 
   meta = {
-    description = "A module provides basic functions for parsing mime-type names and matching them against a list of media-ranges";
-    homepage = https://code.google.com/p/mimeparse/;
+    description = "Useful extra bits for Python - things that should be in the standard library";
+    homepage = "https://github.com/testing-cabal/extras";
     license = lib.licenses.mit;
   };
-}
+}