meta: add releasers as CODEOWNERS to proposal action

PR-URL: nodejs#56043
Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

.github/CODEOWNERS

@@ -143,6 +143,7 @@
 # Actions
 
 /.github/workflows/* @nodejs/actions
+/.github/workflows/create-release-proposal.yml @nodejs/releasers
 /tools/actions/* @nodejs/actions
 
 # Test runner