Upgrade to Psalm v6

Signed-off-by: George Steel <george@net-glue.co.uk>

Author: gsteel

composer.json

@@ -31,9 +31,9 @@
     },
     "require-dev": {
         "laminas/laminas-coding-standard": "~3.1.0",
-        "phpunit/phpunit": "^10.5.38",
-        "psalm/plugin-phpunit": "^0.19.0",
-        "vimeo/psalm": "^6.0.0"
+        "phpunit/phpunit": "^10.5.58",
+        "psalm/plugin-phpunit": "^0.19.5",
+        "vimeo/psalm": "^6.13.1"
     },
     "autoload": {
         "classmap": [