Update tibdex/github-app-token action to v2

Author: renovate[bot]

.github/workflows/device-tests.yml

@@ -55,7 +55,7 @@ jobs:
 
       - name: Authenticate using GitHub App
         id: auth
-        uses: tibdex/github-app-token@v1
+        uses: tibdex/github-app-token@v2
         with:
           app_id: ${{ vars.READ_ONLY_CONTENT_APP_ID }}
           private_key: ${{ secrets.READ_ONLY_CONTENT_APP_PRIVATE_KEY }}