Update psalm/plugin-phpunit requirement from ^0.18.4 to ^0.19.0 (#6)

Updates the requirements on [psalm/plugin-phpunit](https://github.com/psalm/psalm-plugin-phpunit) to permit the latest version.
- [Release notes](https://github.com/psalm/psalm-plugin-phpunit/releases)
- [Commits](psalm/psalm-plugin-phpunit@0.18.4...0.19.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

composer.json

@@ -31,7 +31,7 @@
         "phpstan/phpstan": "^1.12",
         "phpunit/phpunit": "^10.5",
         "vimeo/psalm": "^5.26",
-        "psalm/plugin-phpunit": "^0.18.4",
+        "psalm/plugin-phpunit": "^0.19.0",
         "psalm/plugin-symfony": "^5.0",
         "symfony/phpunit-bridge": "^6.0 || ^7.0",
         "rector/rector": "^1.2"