Cleanup workflows

Author: ishulgin

.github/workflows/codex-update.yml

@@ -85,16 +85,7 @@ jobs:
         run: |
           git push -- origin "$BRANCH"
 
-      - name: Generate GitHub App token
-        id: app-token
-        uses: actions/create-github-app-token@v1
-        with:
-          app-id: ${{ vars.GH_APP_ID }}
-          private-key: ${{ secrets.GH_APP_PRIVATE_KEY }}
-
       - name: Create PR
-        env:
-          GH_TOKEN: ${{ steps.app-token.outputs.token }}
         run: |
           echo -e "[What's new](https://github.com/openai/codex/releases/tag/rust-v${VERSION})\n\n$(cat pr-body.md 2>/dev/null || true)" > pr-body.md