Bump phpunit/phpunit from 8.5.21 to 9.5.10

Bumps [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) from 8.5.21 to 9.5.10.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/master/ChangeLog-8.5.md)
- [Commits](sebastianbergmann/phpunit@8.5.21...9.5.10)

---
updated-dependencies:
- dependency-name: phpunit/phpunit
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

composer.json

@@ -25,7 +25,7 @@
         "ext-json": "*"
     },
     "require-dev": {
-        "phpunit/phpunit": "^8.2"
+        "phpunit/phpunit": "^8.2 || ^9.0"
     },
     "autoload": {
         "psr-4": {