Update phpunit/phpunit requirement from ^9.5.21 to ^10.3.5

Updates the requirements on [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) to permit the latest version.
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/10.3.5/ChangeLog-10.3.md)
- [Commits](sebastianbergmann/phpunit@9.5.21...10.3.5)

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

Signed-off-by: dependabot[bot] <support@github.com>

composer.json

@@ -54,7 +54,7 @@
         "laravel/legacy-factories": "^1.3",
         "mockery/mockery": "^1.5",
         "orchestra/testbench": "^8.3",
-        "phpunit/phpunit": "^9.5.21"
+        "phpunit/phpunit": "^10.3.5"
     },
     "config": {
         "sort-packages": true