mypy fix

src/langchain_mcp/toolkit.py

@@ -68,7 +68,7 @@ def get_tools(self) -> list[BaseTool]:
 }
 
 
-def configure_field(name: str, type_: dict[str, t.Any], required: list[str]) -> t.Tuple[type, t.Any]:
+def configure_field(name: str, type_: dict[str, t.Any], required: list[str]) -> tuple[type, t.Any]:
     field_type = TYPEMAP[type_["type"]]
     default_ = FIELD_DEFAULTS.get(field_type) if name not in required else ...
     return field_type, default_
@@ -90,7 +90,9 @@ def __get_pydantic_json_schema__(
     # Since this langchain patch, we need to synthesize pydantic fields from the schema
     # https://github.com/langchain-ai/langchain/commit/033ac417609297369eb0525794d8b48a425b8b33
     required = schema.get("required", [])
-    fields = {name: configure_field(name, type_, required) for name, type_ in schema["properties"].items()}
+    fields: dict[str, t.Any] = {
+        name: configure_field(name, type_, required) for name, type_ in schema["properties"].items()
+    }
 
     return pydantic.create_model("Schema", __base__=SchemaBase, **fields)