Update vimeo/psalm requirement from ^5.18 to ^5.19 (#160)

Updates the requirements on [vimeo/psalm](https://github.com/vimeo/psalm) to permit the latest version.
- [Release notes](https://github.com/vimeo/psalm/releases)
- [Commits](vimeo/psalm@5.18.0...5.19.0)

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

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composer.json

@@ -21,7 +21,7 @@
     "doctrine/coding-standard": "^12.0",
     "phpunit/phpunit": "^10.5.5",
     "psalm/plugin-phpunit": "^0.18.4",
-    "vimeo/psalm": "^5.18"
+    "vimeo/psalm": "^5.19"
   },
   "autoload": {
     "psr-4": {