gh-132969: Run gh-132969 tests only with "spawn" mp_context

Author: ogbiggles

Lib/test/test_concurrent_futures/test_shutdown.py

@@ -348,9 +348,8 @@ def _run_test_issue_gh_132969(self, max_workers: int) -> int:
         #   a task ends abnormally
         #   shutdown(wait=False) is called
         start_method = self.get_context().get_start_method()
-        if (start_method == "fork" or
-           (start_method == "forkserver" and sys.platform.startswith("win"))):
-                self.skipTest(f"Excluding test with {start_method}=")
+        if start_method != ProcessPoolSpawnMixin.ctx:
+                self.skipTest(f"Skipping test for {start_method}=")
         executor = futures.ProcessPoolExecutor(
                 max_workers=max_workers,
                 max_tasks_per_child=1,