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/python_mimeparse/default.nix

@@ -17,7 +17,7 @@ buildPythonPackage rec {
 
   meta = with stdenv.lib; {
     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/;
+    homepage = "https://github.com/dbtsai/python-mimeparse";
     license = licenses.mit;
   };