doc: update email and mailmap for BethGriggs

PR-URL: nodejs/node#43985
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

.mailmap

@@ -67,7 +67,8 @@ Benjamin Waters <benjamin.waters@outlook.com> <ben25890@gmail.com>
 Bert Belder <bertbelder@gmail.com> <bert@piscisaureus2.(none)>
 Bert Belder <bertbelder@gmail.com> <info@2bs.nl>
 Bert Belder <bertbelder@gmail.com> <piscisaureus@Berts-MacBook-Pro.local>
-Beth Griggs <bgriggs@redhat.com> <Bethany.Griggs@uk.ibm.com>
+Beth Griggs <bethanyngriggs@gmail.com> <Bethany.Griggs@uk.ibm.com>
+Beth Griggs <bethanyngriggs@gmail.com> <bgriggs@redhat.com>
 Bidisha Pyne <pyne.bidisha2017@gmail.com> <bidipyne@in.ibm.com>
 bl-ue <bl-ue@users.noreply.github.com> <54780737+bl-ue@users.noreply.github.com>
 Brad Decker <bhdecker84@gmail.com>

README.md

@@ -159,7 +159,7 @@ For information about the governance of the Node.js project, see
 * [apapirovski](https://github.com/apapirovski) -
   **Anatoli Papirovski** <<apapirovski@mac.com>> (he/him)
 * [BethGriggs](https://github.com/BethGriggs) -
-  **Beth Griggs** <<bgriggs@redhat.com>> (she/her)
+  **Beth Griggs** <<bethanyngriggs@gmail.com>> (she/her)
 * [BridgeAR](https://github.com/BridgeAR) -
   **Ruben Bridgewater** <<ruben@bridgewater.de>> (he/him)
 * [ChALkeR](https://github.com/ChALkeR) -
@@ -279,7 +279,7 @@ For information about the governance of the Node.js project, see
 * [benjamingr](https://github.com/benjamingr) -
   **Benjamin Gruenbaum** <<benjamingr@gmail.com>>
 * [BethGriggs](https://github.com/BethGriggs) -
-  **Beth Griggs** <<bgriggs@redhat.com>> (she/her)
+  **Beth Griggs** <<bethanyngriggs@gmail.com>> (she/her)
 * [bmeck](https://github.com/bmeck) -
   **Bradley Farias** <<bradley.meck@gmail.com>>
 * [bnb](https://github.com/bnb) -
@@ -677,7 +677,7 @@ maintaining the Node.js project.
 
 Primary GPG keys for Node.js Releasers (some Releasers sign with subkeys):
 
-* **Beth Griggs** <<bgriggs@redhat.com>>
+* **Beth Griggs** <<bethanyngriggs@gmail.com>>
   `4ED778F539E3634C779C87C6D7062848A1AB005C`
 * **Bryan English** <<bryan@bryanenglish.com>>
   `141F07595B7B3FFE74309A937405533BE57C7D57`