Put the nesting limit of the serializer back to 25.

Bug: chromium:1034768
Change-Id: I7ea827d27241ea930bae40142069bab1962e4133
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1981156
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65630}