pythonPackages.devpi-common: mark as broken

It fails to build because it depends on packaging <22 while we use
packaging >22.

See the following issues for details:
- NixOS#231346
- devpi/devpi#939

pkgs/development/python-modules/devpi-common/default.nix

@@ -35,5 +35,11 @@ buildPythonPackage rec {
     description = "Utilities jointly used by devpi-server and devpi-client";
     license = licenses.mit;
     maintainers = with maintainers; [ lewo makefu ];
+    # It fails to build because it depends on packaging <22 while we
+    # use packaging >22.
+    # See the following issues for details:
+    # - https://github.com/NixOS/nixpkgs/issues/231346
+    # - https://github.com/devpi/devpi/issues/939
+    broken = true;
   };
 }