fix: add workflow_dispatch trigger to release-please

Allows manually re-triggering release-please from the Actions tab.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: RickyNotaro

.github/workflows/release-please.yml

@@ -3,6 +3,7 @@ name: Release Please
 on:
   push:
     branches: [master]
+  workflow_dispatch:
 
 jobs:
   release-please: