hotfix: downgrade Python for some broken packages

nix/overlays/nixpkgs.nix

@@ -2,4 +2,14 @@
 
 final: prev:
 
-{ }
+{
+  # TODO: remove
+  # https://github.com/NixOS/nixpkgs/pull/263951
+  cutter = prev.cutter.override { python3 = prev.python310; };
+
+} // prev.lib.optionalAttrs prev.stdenv.isDarwin {
+  # FIXME: errors with Python 3.11 in checkPhase
+  # > FileNotFoundError: [Errno 2] No such file or directory: 'locale'
+  magic-wormhole =
+    with prev.python310Packages; toPythonApplication magic-wormhole;
+}