composer(deps-dev): Bump psalm/plugin-phpunit from 0.18.3 to 0.18.4

Bumps [psalm/plugin-phpunit](https://github.com/psalm/psalm-plugin-phpunit) from 0.18.3 to 0.18.4.
- [Release notes](https://github.com/psalm/psalm-plugin-phpunit/releases)
- [Commits](psalm/psalm-plugin-phpunit@0.18.3...0.18.4)

---
updated-dependencies:
- dependency-name: psalm/plugin-phpunit
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

composer.json

@@ -24,7 +24,7 @@
     "ergebnis/license": "^2.1.0",
     "fakerphp/faker": "^1.20.0",
     "phpunit/phpunit": "^9.5.26",
-    "psalm/plugin-phpunit": "~0.18.3",
+    "psalm/plugin-phpunit": "~0.18.4",
     "symfony/filesystem": "^4.4.0 || ^5.0.0",
     "vimeo/psalm": "^5.1"
   },