Update actions/create-github-app-token to v3 (#6060)

Author: rzuckerm

.github/workflows/readme.yml

@@ -24,7 +24,7 @@ jobs:
 
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/create-github-app-token@v2
+    - uses: actions/create-github-app-token@v3
       id: generate-token
       with:
         app-id: ${{ secrets.README_BOT_APP_ID }}