Update phpunit/phpunit requirement from ^10.0 to ^12.3

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/12.3.6/ChangeLog-12.3.md)
- [Commits](sebastianbergmann/phpunit@10.0.0...12.3.6)

---
updated-dependencies:
- dependency-name: phpunit/phpunit
  dependency-version: 12.3.6
  dependency-type: direct:development
...

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

Author: dependabot[bot]

composer.json

@@ -10,7 +10,7 @@
     "require-dev": {
         "roave/security-advisories": "dev-latest",
         "mockery/mockery": "^1.4.2",
-        "phpunit/phpunit": "^10.0",
+        "phpunit/phpunit": "^12.3",
         "orchestra/testbench": "^8.0.10|^9.0.3"
     },
     "license": "MIT",