Use `json_schema_extra` instead of extra keyword in `Field` (#6764)

> Using extra keyword arguments on `Field` is deprecated and will be
removed. Use `json_schema_extra` instead. (Extra keys: 'new_param').
Deprecated in Pydantic V2.0 to be removed in V3.0. See Pydantic V2
Migration Guide at https://errors.pydantic.dev/2.9/migration/

Co-authored-by: Logan Adams <114770087+loadams@users.noreply.github.com>

deepspeed/runtime/zero/config.py

@@ -311,7 +311,7 @@ class DeepSpeedZeroConfig(DeepSpeedConfigModel):
     for efficient all_2_all_reduce comm
     """
 
-    mics_shard_size: int = Field(-1, new_param="mics_shard_size")
+    mics_shard_size: int = Field(-1, json_schema_extra={"new_param": "mics_shard_size"})
 
     mics_hierarchical_params_gather: bool = False