deps: V8: cherry-pick e3d7f8a

Original commit message:

    [build] update gen-postmortem-metadata for Python 3

    This change makes the code compatible with both Python 2 and Python 3.

    Change-Id: I99d68af9c3163607c3a2fdbafac339a98b7471e4
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1751331


    Commit-Queue: Yang Guo <yangguo@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#63207}

Refs: https://github.com/v8/v8/commit/e3d7f8a58887d25919641757a91345c56dda2a52

PR-URL: https://github.com/nodejs/node/pull/29105


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Sam Roberts <vieuxtech@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>