meta: move orangemocha to Collaborator Emeriti list

Alexis confirmed in email that that they should be moved to
the Emeriti list.

PR-URL: https://github.com/nodejs/node/pull/27626


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Alexis Campailla <orangemocha@nodejs.org>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>