fix: remove unnecessary model_config from AgentCoreMemoryConfig

Pydantic v2 handles Callable natively, so arbitrary_types_allowed
is not needed. Removing it avoids any risk of breaking subclasses
or downstream validators.

Author: tejaskash

src/bedrock_agentcore/memory/integrations/strands/config.py

@@ -2,7 +2,7 @@
 
 from typing import Any, Callable, Dict, Optional
 
-from pydantic import BaseModel, ConfigDict, Field, field_validator
+from pydantic import BaseModel, Field, field_validator
 
 
 def normalize_metadata(raw: Dict[str, Any]) -> Dict[str, Any]:
@@ -53,8 +53,6 @@ class AgentCoreMemoryConfig(BaseModel):
             Accepts plain strings (auto-wrapped) or explicit MetadataValue dicts.
     """
 
-    model_config = ConfigDict(arbitrary_types_allowed=True)
-
     memory_id: str = Field(min_length=1)
     session_id: str = Field(min_length=1)
     actor_id: str = Field(min_length=1)