chore: Update to phpfox/container@^0.3

Author: chapterjason

composer.json

@@ -22,7 +22,7 @@
     "juststeveking/http-auth-strategies": "^v1.2",
     "juststeveking/http-slim": "^2.0",
     "juststeveking/uri-builder": "^2.0",
-    "phpfox/container": "^0.2.0"
+    "phpfox/container": "^0.3.0"
   },
   "require-dev": {
     "nyholm/psr7": "^1.4",