composer(deps-dev): update phpstan/phpstan-phpunit requirement

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@1.3.2...1.3.3)

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

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

composer.json

@@ -38,7 +38,7 @@
     "phpstan/extension-installer": "^1.2.0",
     "phpstan/phpstan": "^1.9.4",
     "phpstan/phpstan-deprecation-rules": "^1.1.1",
-    "phpstan/phpstan-phpunit": "^1.3.2",
+    "phpstan/phpstan-phpunit": "^1.3.3",
     "phpunit/phpunit": "^9.5.27"
   },
   "suggest": {