build(deps): bump tibdex/github-app-token from 1 to 2

Bumps [tibdex/github-app-token](https://github.com/tibdex/github-app-token) from 1 to 2.
- [Release notes](https://github.com/tibdex/github-app-token/releases)
- [Commits](tibdex/github-app-token@v1...v2)

---
updated-dependencies:
- dependency-name: tibdex/github-app-token
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/automerge.yml

@@ -14,7 +14,7 @@ jobs:
     steps:
       - name: Generate token
         id: generate_token
-        uses: tibdex/github-app-token@v1
+        uses: tibdex/github-app-token@v2
         with:
           app_id: ${{ secrets.BOT_APP_ID }}
           private_key: ${{ secrets.BOT_PRIVATE_KEY }}