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/ncclient/default.nix

@@ -31,7 +31,7 @@ buildPythonPackage rec {
   doCheck = false;
 
   meta = with stdenv.lib; {
-    homepage = http://ncclient.org/;
+    homepage = "https://github.com/ncclient/ncclient";
     description = "Python library for NETCONF clients";
     license = licenses.asl20;
     maintainers = with maintainers; [ xnaveira ];