composer(deps-dev): update phpunit/phpunit requirement

Updates the requirements on [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) to permit the latest version.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/master/ChangeLog-9.5.md)
- [Commits](sebastianbergmann/phpunit@9.5.9...9.5.10)

---
updated-dependencies:
- dependency-name: phpunit/phpunit
  dependency-type: direct:development
...

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

Author: dependabot[bot]

composer.json

@@ -38,7 +38,7 @@
     "require-dev": {
         "ext-simplexml": "*",
         "composer/composer": "^2.0.13",
-        "phpunit/phpunit": "9.5.9",
+        "phpunit/phpunit": "9.5.10",
         "roave/security-advisories": "dev-latest"
     },
     "config": {