Bump peter-evans/create-or-update-comment from 2 to 4

Bumps [peter-evans/create-or-update-comment](https://github.com/peter-evans/create-or-update-comment) from 2 to 4.
- [Release notes](https://github.com/peter-evans/create-or-update-comment/releases)
- [Commits](peter-evans/create-or-update-comment@v2...v4)

---
updated-dependencies:
- dependency-name: peter-evans/create-or-update-comment
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/greetings.yml

@@ -22,7 +22,7 @@ jobs:
 
       - name: Congratulate on every PR merge
         if: github.event_name == 'pull_request_target' && github.event.action == 'closed' && github.event.pull_request.merged == true
-        uses: peter-evans/create-or-update-comment@v2
+        uses: peter-evans/create-or-update-comment@v4
         with:
           issue-number: ${{tojson(github.event.number)}}
           body: |