[test] Skip typedarray-copywithin on predictable

Bug: v8:9975
Change-Id: I51cbc83adecfa52959c991ed3c6f26cf4929c297
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2215175Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67973}

test/mjsunit/mjsunit.status

@@ -962,6 +962,9 @@
   'wasm/atomics64-stress': [SKIP],
   'wasm/futex': [SKIP],
   'regress/wasm/regress-1067621': [SKIP],
+
+  # BUG(v8:9975).
+  'es6/typedarray-copywithin': [SKIP],
 }],  # 'predictable == True'
 
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