Require release notes for changes in cookiecutter templates

The workflow to check for updates to release notes wasn't taking into
account changes to cookiecutter templates, which are very important to
notify to users.

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

.github/workflows/release-notes-check.yml

@@ -23,6 +23,6 @@ jobs:
         uses: brettcannon/check-for-changed-files@4170644959a21843b31f1181f2a1761d65ef4791 # v1.2.0
         with:
           file-pattern: "RELEASE_NOTES.md"
-          prereq-pattern: "src/**"
+          prereq-pattern: "{src,cookiecutter}/**"
           skip-label: "cmd:skip-release-notes"
           failure-message: "Missing a release notes update. Please add one or apply the ${skip-label} label to the pull request"