Merge remote-tracking branch 'refs/remotes/upstream/file-limit' into file-limit

Author: sokoliva

tests/server/apps/jsonrpc/test_serialization.py

@@ -6,6 +6,7 @@
 from pydantic import ValidationError
 from starlette.testclient import TestClient
 
+from a2a.server.apps.jsonrpc.jsonrpc_app import MAX_CONTENT_LENGTH
 from a2a.server.apps import A2AFastAPIApplication, A2AStarletteApplication
 from a2a.types import (
     APIKeySecurityScheme,