Update phpunit/phpunit requirement from ^9.6.8 to ^9.6.8 || ^10.0.0

Updates the requirements on [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) to permit the latest version.
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/10.5.11/ChangeLog-10.5.md)
- [Commits](sebastianbergmann/phpunit@9.6.8...10.5.11)

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

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

composer.json

@@ -29,7 +29,7 @@
 		"ext-json": "*"
 	},
 	"require-dev": {
-		"phpunit/phpunit": "^9.6.8",
+		"phpunit/phpunit": "^9.6.8 || ^10.0.0",
 		"mikey179/vfsstream": "^1.6.11",
 		"vimeo/psalm": "^5.22.2",
 		"phpspec/prophecy-phpunit": "^2.0.2"