[github-actions] Bump actions/create-github-app-token from 1 to 2 (#58)

Author: dependabot[bot]

.github/workflows/automerge.yaml

@@ -28,7 +28,7 @@ jobs:
     steps:
       - name: Create GitHub App Token
         id: app-token
-        uses: actions/create-github-app-token@v1
+        uses: actions/create-github-app-token@v2
         with:
           app-id: ${{ secrets.APP_ID }}
           private-key: ${{ secrets.APP_KEY }}