Updated minimum vimeo/psalm to v6.13.

Author: danielmorell

composer.json

@@ -42,7 +42,7 @@
     "mockery/mockery": "^1.5.1",
     "squizlabs/php_codesniffer": "^3.7",
     "phpmd/phpmd" : "^2.13",
-    "vimeo/psalm": "^5.9 || ^6.13"
+    "vimeo/psalm": "^6.13"
   },
 
   "suggest": {