fix: AsyncAPI v3 shows warning in Studio and IntelliJ plugin when ref…

…erencing a a json schema

Change allOf to anyOf in multiFormatSchema

#494
asyncapi/jasyncapi-idea-plugin#49

schemas/3.0.0-without-$id.json

@@ -2702,7 +2702,7 @@
                         "description": "Definition of the message payload. It can be of any type but defaults to Schema Object. It MUST match the schema format defined in schemaFormat, including the encoding type. E.g., Avro should be inlined as either a YAML or JSON object instead of as a string to be parsed as YAML or JSON. Non-JSON-based schemas (e.g., Protobuf or XSD) MUST be inlined as a string."
                     }
                 },
-                "allOf": [
+                "anyOf": [
                     {
                         "if": {
                             "not": {