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

Updates the requirements on [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) to permit the latest version.
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/10.5.3/ChangeLog-10.5.md)
- [Commits](sebastianbergmann/phpunit@9.6.0...10.5.3)

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

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

composer.json

@@ -24,7 +24,7 @@
     "require-dev": {
         "ergebnis/composer-normalize": "^2.39",
         "orchestra/testbench": "^7.35.0 || ^8.0",
-        "phpunit/phpunit": "^9.6.0"
+        "phpunit/phpunit": "^10.5.3"
     },
     "minimum-stability": "dev",
     "prefer-stable": true,