doc: update contact information for @BethGriggs

PR-URL: https://github.com/nodejs/node/pull/35451


Reviewed-By: Stewart X Addison <sxa@uk.ibm.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>