doc: move digitalinfinity to emeritus

Had an email exchange with Hitesh where he indicated that it was a fine
time to move him to emeritus.

PR-URL: https://github.com/nodejs/node/pull/34191


Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Matheus Marchini <mat@mmarchini.me>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>