chore(deps): update actions/create-github-app-token action to v3

Author: renovate[bot]

.github/workflows/nightly-stack-sync.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Generate app token
-        uses: actions/create-github-app-token@v2
+        uses: actions/create-github-app-token@v3
         id: app-token
         with:
           app-id: ${{ secrets.APP_ID }}

.github/workflows/renovate-stack-sync.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Generate app token
-        uses: actions/create-github-app-token@v2
+        uses: actions/create-github-app-token@v3
         id: app-token
         with:
           app-id: ${{ secrets.APP_ID }}