Fix security vulnerabilities in dependencies

What's Changed

• Bump symfony/process from 7.3.0 to 7.4.5 by @dependabot[bot] in #48
• Bump phpunit/phpunit from 11.5.28 to 11.5.50 by @dependabot[bot] in #47

New Contributors

• @dependabot[bot] made their first contribution in #48

Full Changelog: v8.1.1...v8.1.2