chore: prepare release 5.3.0

Author: tinect

composer.json

@@ -11,7 +11,7 @@
         "thumbnail"
     ],
     "description": "This plugins allows you to use variable thumbnails, without having them on storage.",
-    "version": "5.2.1",
+    "version": "5.3.0",
     "type": "shopware-platform-plugin",
     "license": "mit",
     "authors": [