Update phpunit/phpunit requirement from ^9.6 to ^9.6 || ^10.0

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/10.5.20/ChangeLog-10.5.md)
- [Commits](sebastianbergmann/phpunit@9.6.0...10.5.20)

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

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

composer.json

@@ -27,7 +27,7 @@
     },
     "require-dev": {
         "dg/bypass-finals": "^1.6",
-        "phpunit/phpunit": "^9.6"
+        "phpunit/phpunit": "^9.6 || ^10.0"
     },
     "config": {
         "bin-dir": "bin"