fix together inference validator

llama_stack/providers/remote/inference/together/__init__.py

@@ -4,9 +4,15 @@
 # This source code is licensed under the terms described in the LICENSE file in
 # the root directory of this source tree.
 
+from pydantic import BaseModel
+
 from .config import TogetherImplConfig
 
 
+class TogetherProviderDataValidator(BaseModel):
+    together_api_key: str
+
+
 async def get_adapter_impl(config: TogetherImplConfig, _deps):
     from .together import TogetherInferenceAdapter