meta: update collaborator email address in README

PR-URL: https://github.com/nodejs/node/pull/45251
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Steven R Loomis <srloomis@us.ibm.com>
Reviewed-By: Richard Lau <rlau@redhat.com>

README.md

@@ -425,7 +425,7 @@ For information about the governance of the Node.js project, see
 * [ShogunPanda](https://github.com/ShogunPanda) -
   **Paolo Insogna** <<paolo@cowtech.it>> (he/him)
 * [srl295](https://github.com/srl295) -
-  **Steven R Loomis** <<srloomis@us.ibm.com>>
+  **Steven R Loomis** <<srl295@gmail.com>>
 * [starkwang](https://github.com/starkwang) -
   **Weijia Wang** <<starkwang@126.com>>
 * [sxa](https://github.com/sxa) -