deps: upgrade fastmcp optional extra to 3.x

mostlyai/mock/core.py

@@ -836,6 +836,10 @@ def supports_structured_outputs(model: str) -> bool:
 
     llm_output_format = LLMOutputFormat.JSON if supports_structured_outputs(llm_config.model) else LLMOutputFormat.CSV
 
+    # Callers pass batch_size=None explicitly; that overrides the parameter default unless normalized here.
+    if batch_size is None:
+        batch_size = 20
+
     previous_rows = deque(maxlen=previous_rows_size)
 
     # derive data for augmentation

pyproject.toml

@@ -37,7 +37,7 @@ litellm-proxy = [
     "litellm[proxy]>=1.67.0",
 ]
 mcp = [
-    "fastmcp>=2.0.0,<3.0.0",
+    "fastmcp>=3.0.0,<4.0.0",
 ]
 
 [dependency-groups]