deps: V8: set correct V8 version patch number

The update to V8 8.6 already included the changes from that version,
but it wasn't tagged yet. Having the wrong version in tree breaks
node-core-utils.

PR-URL: https://github.com/nodejs/node/pull/35732


Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Myles Borins <myles.borins@gmail.com>
Reviewed-By: Beth Griggs <bgriggs@redhat.com>