doc: update mmarchini contact info

PR-URL: #34586
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>

AUTHORS

@@ -1983,7 +1983,7 @@ Pierre-Loic Doulcet <pierre@pld.io>
 Fran Herrero <francisco.herrero@axa-groupsolutions.com>
 Francois KY <ky.francois.3@gmail.com>
 suman-mitra <summitra@in.ibm.com>
-Matheus Marchini <mat@mmarchini.me>
+Mary Marchini <oss@mmarchini.me>
 neta <neta@netush>
 Whien <sal95610@gmail.com>
 Chiahao Lin <y80811@gmail.com>

README.md

@@ -184,7 +184,7 @@ For information about the governance of the Node.js project, see
 * [mhdawson](https://github.com/mhdawson) -
 **Michael Dawson** <michael_dawson@ca.ibm.com> (he/him)
 * [mmarchini](https://github.com/mmarchini) -
-**Matheus Marchini** <mat@mmarchini.me>
+**Mary Marchini** <oss@mmarchini.me>
 * [MylesBorins](https://github.com/MylesBorins) -
 **Myles Borins** <myles.borins@gmail.com> (he/him)
 * [targos](https://github.com/targos) -
@@ -360,7 +360,7 @@ For information about the governance of the Node.js project, see
 * [misterdjules](https://github.com/misterdjules) -
 **Julien Gilli** <jgilli@nodejs.org>
 * [mmarchini](https://github.com/mmarchini) -
-**Matheus Marchini** <mat@mmarchini.me>
+**Mary Marchini** <oss@mmarchini.me>
 * [mscdex](https://github.com/mscdex) -
 **Brian White** <mscdex@mscdex.net>
 * [MylesBorins](https://github.com/MylesBorins) -