doc: remove some news issues that are no longer

Signed-off-by: Michael Dawson <midawson@redhat.com>
PR-URL: #53608
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>

Author: mhdawson

doc/contributing/sharing-project-news.md

@@ -27,10 +27,8 @@ that promotes a specific company or commercial interest.
 
 ## Teams doing updates
 
-* [Node.js core](https://github.com/orgs/nodejs/discussions/47703).
 * [node-api/node-addon-api](https://github.com/nodejs/abi-stable-node/issues/459).
 * [uvwasi](https://github.com/nodejs/uvwasi/issues/201).
-* [security-team](https://github.com/nodejs/security-wg/issues/1006).
 * [Website team](https://github.com/nodejs/nodejs.org/issues/5602).
 * [diagnostics team](https://github.com/nodejs/diagnostics/issues/619).
 * [ambassadors](https://github.com/nodejs/nodejs-ambassadors/issues/2).