python311Packages.quart: disable failing tests

The signal tests have been removed for the next release already.

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

···
     pytestCheckHook
   ];
 
+  disabledTestPaths = [
+    # remove after 0.18.4
+    "tests/test_signals.py"
+  ];
+
   meta = with lib; {
     description = "An async Python micro framework for building web applications";
     homepage = "https://github.com/pallets/quart/";