Update phpunit/phpunit requirement from ^9.5 to ^10.1 (#30)

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/10.1.0/ChangeLog-10.1.md)
- [Commits](sebastianbergmann/phpunit@9.5.0...10.1.0)

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

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Author: dependabot[bot]

composer.json

@@ -32,7 +32,7 @@
         "yiisoft/mutex": "^1.1"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.5",
+        "phpunit/phpunit": "^10.1",
         "roave/infection-static-analysis-plugin": "^1.16",
         "spatie/phpunit-watcher": "^1.23",
         "vimeo/psalm": "^4.30|^5.3"