Update dependency justinrainbow/json-schema to v5.3.0

Author: renovate[bot]

composer.json

@@ -31,7 +31,7 @@
         "sunrise/http-factory": "1.1.0",
         "sunrise/http-router": "^2.11",
         "symfony/console": "^4.4",
-        "justinrainbow/json-schema": "5.2.10"
+        "justinrainbow/json-schema": "5.3.0"
     },
     "autoload": {
         "psr-4": {