chore(deps): bump tibdex/github-app-token from 1.6.0 to 1.7.0 (#3789)

Bumps [tibdex/github-app-token](https://github.com/tibdex/github-app-token) from 1.6.0 to 1.7.0.
- [Release notes](https://github.com/tibdex/github-app-token/releases)
- [Commits](tibdex/github-app-token@f717b5e...021a240)

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

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

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

.github/workflows/backport.yaml

@@ -14,7 +14,7 @@ jobs:
     steps:
       - name: Generate token
         id: generate_token
-        uses: tibdex/github-app-token@f717b5ecd4534d3c4df4ce9b5c1c2214f0f7cd06
+        uses: tibdex/github-app-token@021a2405c7f990db57f5eae5397423dcc554159c
         with:
           app_id: ${{ secrets.BACKPORT_APP_APPID }}
           private_key: ${{ secrets.BACKPORT_APP_PRIVATE_KEY }}