Promote the Windows binary package when publishing a release

draft-release in ruby/actions stages an mswin binary zip next to the draft tarballs, but nothing promotes it to pub/ruby/binaries, so each release has needed a manual publish-binaries run. Dispatch it alongside the other post-release hooks.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.github/workflows/publish.yml

@@ -73,6 +73,15 @@ jobs:
             https://api.github.com/repos/ruby/actions/dispatches \
             -d '{"event_type": "update_index"}'
 
+      - name: Publish Windows binary package
+        run: |
+          curl -L -X POST \
+            -H "Authorization: Bearer ${{ secrets.MATZBOT_GITHUB_WORKFLOW_TOKEN }}" \
+            -H "Accept: application/vnd.github+json" \
+            -H "X-GitHub-Api-Version: 2022-11-28" \
+            https://api.github.com/repos/ruby/actions/dispatches \
+            -d "{\"event_type\": \"publish-binaries\", \"client_payload\": {\"version\": \"${RUBY_VERSION}\"}}"
+
       - name: Build and push Docker images
         run: |
           curl -L -X POST \