Update phpstan/phpstan-phpunit requirement from ^1.0 to ^1.1

Updates the requirements on [phpstan/phpstan-phpunit](https://github.com/phpstan/phpstan-phpunit) to permit the latest version.
- [Release notes](https://github.com/phpstan/phpstan-phpunit/releases)
- [Commits](phpstan/phpstan-phpunit@1.0.0...1.1.1)

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

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

Author: dependabot[bot]

composer.json

@@ -86,7 +86,7 @@
         "phpstan/extension-installer": "^1.1",
         "phpstan/phpstan": "^1.0",
         "phpstan/phpstan-deprecation-rules": "^1.0",
-        "phpstan/phpstan-phpunit": "^1.0",
+        "phpstan/phpstan-phpunit": "^1.1",
         "phpstan/phpstan-strict-rules": "^1.0",
         "phpunit/phpunit": "^9.5.5",
         "rector/rector": "^0.14",