Python: replace requests2 with requests tree-wide

See f63eb58573

The `requests2` attribute now throws an error informing that `requests`
should be used instead.

pkgs/applications/networking/sync/acd_cli/default.nix

@@ -1,5 +1,5 @@
 { stdenv, fetchFromGitHub, buildPythonApplication, fuse
-, appdirs, colorama, dateutil, requests2, requests_toolbelt
+, appdirs, colorama, dateutil, requests, requests_toolbelt
 , fusepy, sqlalchemy }:
 
 buildPythonApplication rec {
@@ -16,7 +16,7 @@ buildPythonApplication rec {
     sha256 = "0a0fr632l24a3jmgla3b1vcm50ayfa9hdbp677ch1chwj5dq4zfp";
   };
 
-  propagatedBuildInputs = [ appdirs colorama dateutil fusepy requests2
+  propagatedBuildInputs = [ appdirs colorama dateutil fusepy requests
                             requests_toolbelt sqlalchemy ];
 
   makeWrapperArgs = [ "--prefix LIBFUSE_PATH : ${fuse}/lib/libfuse.so" ];