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/geopandas/default.nix

@@ -29,7 +29,7 @@ buildPythonPackage rec {
 
   meta = with stdenv.lib; {
     description = "Python geospatial data analysis framework";
-    homepage = https://geopandas.org;
+    homepage = "http://geopandas.org";
     license = licenses.bsd3;
     maintainers = with maintainers; [ knedlsepp ];
   };