ci: bump tibdex/github-app-token in /.github/actions/github-app-token

Bumps [tibdex/github-app-token](https://github.com/tibdex/github-app-token) from 1.7.0 to 2.1.0.
- [Release notes](https://github.com/tibdex/github-app-token/releases)
- [Commits](tibdex/github-app-token@021a240...3beb63f)

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

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

.github/actions/github-app-token/action.yaml

@@ -17,7 +17,7 @@ outputs:
 runs:
   using: 'composite'
   steps:
-    - uses: tibdex/github-app-token@021a2405c7f990db57f5eae5397423dcc554159c # v1.5 # cspell:ignore tibdex
+    - uses: tibdex/github-app-token@3beb63f4bd073e61482598c45c71c1019b59b73a # v1.5 # cspell:ignore tibdex
       id: generate-token
       with:
         app_id: ${{ inputs.app_id }}