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/scala-steward.yml

@@ -12,7 +12,7 @@ jobs:
     steps:
     - name: Generate token
       id: generate_token
-      uses: tibdex/github-app-token@v1
+      uses: tibdex/github-app-token@v2
       with:
         app_id: 89697
         private_key: ${{ secrets.FOUNDWEEKENDS_BOT_KEY }}