composer(deps-dev): Bump phpstan/phpstan-phpunit from 1.3.16 to 1.4.0

Bumps [phpstan/phpstan-phpunit](https://github.com/phpstan/phpstan-phpunit) from 1.3.16 to 1.4.0.
- [Release notes](https://github.com/phpstan/phpstan-phpunit/releases)
- [Commits](phpstan/phpstan-phpunit@1.3.16...1.4.0)

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

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

composer.json

@@ -45,7 +45,7 @@
     "phpstan/phpstan": "^1.10.67",
     "phpstan/phpstan-deprecation-rules": "^1.1.4",
     "phpstan/phpstan-doctrine": "^1.3.69",
-    "phpstan/phpstan-phpunit": "^1.3.16",
+    "phpstan/phpstan-phpunit": "^1.4.0",
     "phpstan/phpstan-strict-rules": "^1.5.5",
     "phpunit/phpunit": "^10.5.20",
     "psalm/plugin-phpunit": "~0.19.0",