Bump tibdex/github-app-token from 1.3.0 to 1.6

Bumps [tibdex/github-app-token](https://github.com/tibdex/github-app-token) from 1.3.0 to 1.6.
- [Release notes](https://github.com/tibdex/github-app-token/releases)
- [Commits](tibdex/github-app-token@36464ac...f717b5e)

---
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>

.github/workflows/issue_tracker.yml

@@ -14,7 +14,7 @@ jobs:
     steps:
       - name: Generate token
         id: generate_token
-        uses: tibdex/github-app-token@36464acb844fc53b9b8b2401da68844f6b05ebb0
+        uses: tibdex/github-app-token@f717b5ecd4534d3c4df4ce9b5c1c2214f0f7cd06
         with:
           app_id: ${{ secrets.ISSUE_APP_ID }}
           private_key: ${{ secrets.ISSUE_APP_PEM }}