GitHub Actions: Update to Psalm 4.5

Author: PhrozenByte

composer.json

@@ -34,10 +34,10 @@
         "phpunit/phpunit": "<8.0"
     },
     "require-dev": {
+        "vimeo/psalm": "^4.5",
         "phpunit/phpunit": "^8",
         "mockery/mockery": "^1.3",
         "symfony/yaml": "^4.4",
-        "vimeo/psalm": "^4.4",
         "incompass/coverage": "^1.0"
     },
     "extra": {