Update postmortem metadata constants for V8 7.4 in Node.js.

Change-Id: I7d248b345e0326dafb776e144a6a22a381a05fc1
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1546049
Commit-Queue: Yang Guo <yangguo@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#63189}