python31{1,2}Packages.textual: fix evaluation

Don't depend on tree-sitter-languages for testing, as it is marked as
broken. Fixes also: https://github.com/NixOS/nixpkgs/issues/331260

pkgs/development/python-modules/textual/default.nix

@@ -51,7 +51,8 @@ buildPythonPackage rec {
     pytestCheckHook
     syrupy
     time-machine
-  ] ++ lib.flatten (builtins.attrValues optional-dependencies);
+    tree-sitter
+  ];
 
   disabledTestPaths = [
     # Snapshot tests require syrupy<4