Update phpunit/phpunit requirement from ^9.5.25 to ^10.5.15

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/10.5.15/ChangeLog-10.5.md)
- [Commits](sebastianbergmann/phpunit@9.5.25...10.5.15)

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

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

composer.json

@@ -40,7 +40,7 @@
     "require-dev": {
         "mockery/mockery": "^1.5",
         "orchestra/testbench": "^7.23|^8.1.1",
-        "phpunit/phpunit": "^9.5.25"
+        "phpunit/phpunit": "^10.5.15"
     },
     "config": {
         "sort-packages": true