Fix type hint DataTransfer.data. (#537)

In 2.0.1 both DataTransferRequest and DataTransferResponse have a field
called `data` which is defined as `AnyType` so I believe these should
both by of type `Any` here

Author: mdwcrft

CHANGELOG.md

@@ -1,6 +1,7 @@
 # Change log
 
 - [#516](https://github.com/mobilityhouse/ocpp/issues/516) OCPP 2.0.1 add additional security events from v1.3
+- [#537] (https://github.com/mobilityhouse/ocpp/pull/537) Fix DataTransfer data types 
 
 ## 0.23.0 (2023-11-30)
 

ocpp/v201/call.py

@@ -90,7 +90,7 @@ class CustomerInformationPayload:
 class DataTransferPayload:
     vendor_id: str
     message_id: Optional[str] = None
-    data: Optional[str] = None
+    data: Optional[Any] = None
     custom_data: Optional[Dict[str, Any]] = None
 
 

ocpp/v201/call_result.py

@@ -87,7 +87,7 @@ class CustomerInformationPayload:
 class DataTransferPayload:
     status: str
     status_info: Optional[Dict] = None
-    data: Optional[Dict] = None
+    data: Optional[Any] = None
     custom_data: Optional[Dict[str, Any]] = None