Bump the actions group with 1 update (#1965)

Bumps the actions group with 1 update: [actions/setup-node](https://github.com/actions/setup-node).

- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](https://github.com/actions/setup-node/compare/v3...v4)

---
updated-dependencies:
- dependency-name: actions/setup-node
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/post-release-mergeback.yml

@@ -36,7 +36,7 @@ jobs:
         run: echo "${GITHUB_CONTEXT}"
 
       - uses: actions/checkout@v4
-      - uses: actions/setup-node@v3
+      - uses: actions/setup-node@v4
 
       - name: Update git config
         run: |