meta: warnings bypass deprecation cycle

Allow for emitting new warnings without going through a deprecation
cycle.

Co-authored-by: Antoine du Hamel <duhamelantoine1995@gmail.com>
PR-URL: https://github.com/nodejs/node/pull/53513
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Geoffrey Booth <webadmin@geoffreybooth.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Yagiz Nizipli <yagiz.nizipli@sentry.io>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>

doc/contributing/collaborator-guide.md

@@ -361,6 +361,7 @@ Existing stable public APIs that change in a backward-incompatible way must
 undergo deprecation. The exceptions to this rule are:
 
 * Adding or removing errors thrown or reported by a public API.
+* Emitting a runtime warning.
 * Changing error messages for errors without error code.
 * Altering the timing and non-internal side effects of the public API.
 * Changes to errors thrown by dependencies of Node.js, such as V8.