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/flask-elastic/default.nix

@@ -17,6 +17,6 @@ buildPythonPackage rec {
     description = "Integrates official client for Elasticsearch into Flask";
     license = licenses.bsd3;
     maintainers = [ maintainers.mic92 ];
-    homepage = https://github.com/cepture/foppch/flask-elastic;
+    homepage = "https://github.com/marceltschoppch/flask-elastic";
   };
 }