Switch to github app token for dependencies pull requests

.github/workflows/update-dependencies.yaml

@@ -27,11 +27,17 @@ jobs:
         run: |
           pip install pip-tools invoke
           invoke update-dependencies --no-sync
+      - name: Generate token
+        uses: tibdex/github-app-token@v1
+        id: generate-token
+        with:
+          app_id: ${{ secrets.PR_APP_ID }}
+          private_key: ${{ secrets.PR_APP_PRIVATE_KEY }}
       - name: Create Pull Request
         uses: peter-evans/create-pull-request@v4
         id: create-pull-request
         with:
-          token: ${{ secrets.PERSONAL_TOKEN_PR }}
+          token: ${{ steps.generate-token.outputs.token }}
           commit-message: Update dependencies
           base: master
           branch: update-dependencies