ci(tools): update actions/create-github-app-token action to v3

Author: renovate[bot]

.github/workflows/automerge.yml

@@ -20,7 +20,7 @@ jobs:
     steps:
       - name: Generate token
         id: token
-        uses: actions/create-github-app-token@fee1f7d63c2ff003460e3d139729b119787bc349 # v2
+        uses: actions/create-github-app-token@f8d387b68d61c58ab83c6c016672934102569859 # v3
         with:
           app-id: ${{ secrets.TOKEN_EXCHANGE_APP }}
           private-key: ${{ secrets.TOKEN_EXCHANGE_KEY }}