[Test] [Client] Skip `test_delay_in_rewriting_environment` on MacOS
diff --git a/python/ray/tests/test_client_proxy.py b/python/ray/tests/test_client_proxy.py
index c518329dd8e56..6c72c2093051d 100644
--- a/python/ray/tests/test_client_proxy.py
+++ b/python/ray/tests/test_client_proxy.py
@@ -133,8 +133,8 @@ def test_correct_num_clients(call_ray_start):
 
 
 @pytest.mark.skipif(
-    sys.platform == "win32",
-    reason="PSUtil does not work the same on windows.")
+    sys.platform != "linux",
+    reason="PSUtil does not work the same on windows & MacOS if flaky.")
 def test_delay_in_rewriting_environment(shutdown_only):
     """
     Check that a delay in `ray_client_server_env_prep` does not break

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## Why are these changes needed?
* `test_client_proxy::test_delay_in_rewriting_environment` has been quite Flaky on MacOS
* This test is **fine to skip**, because the ClientServer Proxy is used for remote clusters (which are linux).

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## Related issue number

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## Checks

- [ ] I've run `scripts/format.sh` to lint the changes in this PR.
- [ ] I've included any doc changes needed for https://docs.ray.io/en/master/.
- [ ] I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failures at https://flakey-tests.ray.io/
- Testing Strategy
   - [ ] Unit tests
   - [ ] Release tests
   - [ ] This PR is not tested :(
