Bump phpunit/phpunit from 11.1.3 to 11.2.9 (#161)

Bumps [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) from 11.1.3 to 11.2.9.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/11.2.9/ChangeLog-11.2.md)
- [Commits](sebastianbergmann/phpunit@11.1.3...11.2.9)

---
updated-dependencies:
- dependency-name: phpunit/phpunit
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

composer.json

@@ -29,7 +29,7 @@
     },
     "require-dev": {
         "infection/infection": "~0",
-        "phpunit/phpunit": "~11",
+        "phpunit/phpunit": "~12",
         "psalm/phar": "^6.9"
     }
 }