[test] skip regress/regress-crbug-1239907 on TSAN

Bug: v8:12822
Change-Id: Idc8225640e132d175d2c06b530d77fcda7362b55
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3599486
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Tobias Tebbi <tebbi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80092}

test/mjsunit/mjsunit.status

@@ -728,6 +728,9 @@
 
   # BUG(v8:11745) The test allocates too much memory, making it slow on TSAN.
   'compiler/regress-crbug-11564': [SKIP],
+
+  # BUG(v8:12822): Flakes on TSAN.
+  'regress/regress-crbug-1239907': [SKIP],
 }],  # 'tsan == True'
 
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