fix: add puppeteer-core to production dependencies

puppeteer-extra requires puppeteer-core as a peer dependency, but it was
only available through puppeteer in devDependencies. This caused the
"Cannot find module 'puppeteer-core'" error when running via npx.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: Nima21

.release-please-manifest.json

@@ -1,3 +1,3 @@
 {
-  ".": "0.12.2"
+  ".": "0.12.3"
 }