test: remove outdated V8 flag

The flag is going to be removed upstream in V8 9.0.

Refs: https://github.com/v8/v8/commit/0a480c30d553c1b8dddb0dddcbdec5fb6f3101ff

PR-URL: https://github.com/nodejs/node/pull/37151


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>