Update actions/create-github-app-token action to v2 (#680)

Co-authored-by: small-hack-renovate[bot] <151926327+small-hack-renovate[bot]@users.noreply.github.com>

Author: small-hack-renovate[bot]

.github/workflows/renovate.yml

@@ -18,7 +18,7 @@ jobs:
     steps:
       - name: Get token
         id: app-token
-        uses: actions/create-github-app-token@v1
+        uses: actions/create-github-app-token@v2
         with:
           private-key: ${{ secrets.PRIVATE_KEY }}
           app-id: ${{ secrets.APP_ID }}