Skip the test for old namespace package based on pkg_resource

It won't work when the package is removed anyway

Author: Pierre-Sassoulas

tests/test_manager.py

@@ -117,6 +117,10 @@ def test_ast_from_namespace_pkgutil(self) -> None:
     def test_ast_from_namespace_pkg_resources(self) -> None:
         self._test_ast_from_old_namespace_package_protocol("pkg_resources")
 
+    @pytest.mark.skipif(
+        PY312_PLUS or IS_PYPY,
+        reason="The pkg_resources package is slated for removal as early as 2025-11-30",
+    )
     def test_identify_old_namespace_package_protocol(self) -> None:
         # Like the above cases, this package follows the old namespace package protocol
         # astroid currently assumes such packages are in sys.modules, so import it