deps: V8: update postmortem metadata generation script

Update postmortem metadata constants for V8 7.5 in Node.js.

PR-URL: https://github.com/nodejs/node/pull/26685


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>