python3Packages.google-auth-oauthlib: fix build on darwin (#204589)

Co-authored-by: Sandro <[e-mail]>

pkgs/development/python-modules/google-auth-oauthlib/default.nix

···
     pytestCheckHook
   ];
 
-  disabledTests = lib.optionals stdenv.isDarwin [
-    "test_run_local_server"
-  ];
+  # some tests require loopback networking
+  __darwinAllowLocalNetworking = true;
 
   pythonImportsCheck = [
     "google_auth_oauthlib"