[github-actions] Bump actions/create-github-app-token from 2 to 3

Bumps [actions/create-github-app-token](https://github.com/actions/create-github-app-token) from 2 to 3.
- [Release notes](https://github.com/actions/create-github-app-token/releases)
- [Commits](actions/create-github-app-token@v2...v3)

---
updated-dependencies:
- dependency-name: actions/create-github-app-token
  dependency-version: '3'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/automerge.yaml

@@ -28,7 +28,7 @@ jobs:
     steps:
       - name: Create GitHub App Token
         id: app-token
-        uses: actions/create-github-app-token@v2
+        uses: actions/create-github-app-token@v3
         with:
           app-id: ${{ secrets.APP_ID }}
           private-key: ${{ secrets.APP_KEY }}