ci: upgrade GitHub Actions to support Node.js 24 (#951)

* ci: upgrade GitHub Actions to support Node.js 24

- pnpm/action-setup: v4 → v5
- actions/upload-artifact: v4 → v6
- actions/download-artifact: v4 → v6
- sync.yaml: replace inactive aormsby/Fork-Sync-With-Upstream-action with gh repo sync

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* ci: replace softprops/action-gh-release with gh release CLI

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix(ci): use gh release upload instead of create for existing releases

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/sync.yaml

@@ -12,14 +12,7 @@ jobs:
     if: ${{ github.event.repository.fork }}
 
     steps:
-      - uses: actions/checkout@v6
-
       - name: Sync upstream changes
-        id: sync
-        uses: aormsby/Fork-Sync-With-Upstream-action@v3.4
-        with:
-          upstream_sync_repo: dreamhunter2333/cloudflare_temp_email
-          upstream_sync_branch: main
-          target_sync_branch: main
-          target_repo_token: ${{ secrets.GITHUB_TOKEN }} # automatically generated, no need to set
-          test_mode: false
+        run: gh repo sync ${{ github.repository }} --source dreamhunter2333/cloudflare_temp_email --branch main
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}