Add missing status annotation for regress-1262423

No-Try: true
Bug: chromium:1262423
Change-Id: I9d56e347d046944f01e33aa6fb8752c889e2d38d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3240784
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Auto-Submit: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77517}

test/mjsunit/mjsunit.status

@@ -424,6 +424,7 @@
   # Desugaring regexp property class relies on ICU. Anything goes as long as we
   # don't crash.
   'harmony/regexp-property-*': [PASS,FAIL],
+  'regress/regress-1262423': [PASS,FAIL],
   'regress/regress-793588': [PASS,FAIL],
 
   # noi18n build cannot parse characters in supplementary plane.