doc: add @bnb as a collaborator

Signed-off-by: Tierney Cyren <hello@bnb.im>

PR-URL: nodejs#41100
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>

README.md

@@ -290,6 +290,8 @@ For information about the governance of the Node.js project, see
   **Beth Griggs** <<bgriggs@redhat.com>> (she/her)
 * [bmeck](https://github.com/bmeck) -
   **Bradley Farias** <<bradley.meck@gmail.com>>
+* [bnb](https://github.com/bnb) -
+  **Tierney Cyren** <<hello@bnb.im>> (they/he)
 * [boneskull](https://github.com/boneskull) -
   **Christopher Hiller** <<boneskull@boneskull.com>> (he/him)
 * [BridgeAR](https://github.com/BridgeAR) -