composer(deps): bump phpunit/phpunit from 9.5.9 to 11.5.2 in /src/php

Bumps [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) from 9.5.9 to 11.5.2.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/11.5.2/ChangeLog-11.5.md)
- [Commits](sebastianbergmann/phpunit@9.5.9...11.5.2)

---
updated-dependencies:
- dependency-name: phpunit/phpunit
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

src/php/composer.json

@@ -3,7 +3,7 @@
     "description": "",
     "require": {
         "php": "^8.0",
-        "phpunit/phpunit": "^9.5"
+        "phpunit/phpunit": "^11.5"
     },
     "autoload-dev": {
         "files": [