[wasm] Skip grow-shared-memory on gc_stress + slow_path

The test is timing out a lot recently, blocking the LKGR.
The underlying issue still needs to be found and fixed.
If the test passes, it is fast.

TBR=titzer@chromium.org

No-Try: true
Bug: v8:9221
Change-Id: Ie2cbfa310a5088ed736cfd930eefe993e68af9b3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1599550
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61302}

test/mjsunit/mjsunit.status

@@ -1021,6 +1021,9 @@
   # Slow tests.
   'regress/regress-crbug-493779': [SKIP],
   'string-replace-gc': [SKIP],
+
+  # https://crbug.com/v8/9221
+  'wasm/grow-shared-memory': [SKIP],
 }],  # variant == slow_path
 
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