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

Author: renovate[bot]

.github/workflows/update-flake-inputs.yaml

@@ -52,7 +52,7 @@ jobs:
     steps:
       - name: Generate GitHub App Token
         id: app-token
-        uses: actions/create-github-app-token@29824e69f54612133e76f7eaac726eef6c875baf # v2
+        uses: actions/create-github-app-token@7bd03711494f032dfa3be3558f7dc8787b0be333 # v3
         with:
           app-id: ${{ secrets.FLAKE_UPDATER_APP_ID }}
           private-key: ${{ secrets.FLAKE_UPDATER_PRIVATE_KEY }}