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](https://github.com/sebastianbergmann/phpunit/compare/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

@@ -83,7 +83,7 @@
         "phpcompatibility/php-compatibility": "^9.3",
         "phpstan/phpstan": "^0.12.82",
         "phpstan/phpstan-phpunit": "^0.12.18",
-        "phpunit/phpunit": "^8.5",
+        "phpunit/phpunit": "^8.5 || ^9.0",
         "squizlabs/php_codesniffer": "^3.5",
         "tecnickcom/tcpdf": "^6.3"
     },