Apply suggestions from code review

Co-authored-by: Daniël van Noord <13665637+DanielNoord@users.noreply.github.com>

Author: Pierre-Sassoulas

pylint/reporters/json_reporter.py

@@ -61,11 +61,11 @@ def _display(self, layout: Section) -> None:
         """Do nothing."""
 
     @staticmethod
-    def serialize(message: Message) -> Any:
+    def serialize(message: Message) -> OldJsonExport:
         raise NotImplementedError
 
     @staticmethod
-    def deserialize(message_as_json: Any) -> Message:
+    def deserialize(message_as_json: OldJsonExport) -> Message:
         raise NotImplementedError