Fix security vulnerabilities in dependencies

Update composer dependencies to address Dependabot alerts:
- symfony/http-foundation v7.2.2 → v7.4.1 (CVE-2025-64500)
- league/commonmark 2.6.1 → 2.8.0 (CVE-2025-46734)
- laravel/framework v11.39.1 → v11.47.0 (CVE-2025-27515)

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

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

Author: spawnia