fix mypy

python/semantic_kernel/connectors/ai/ollama/services/ollama_chat_completion.py

@@ -300,7 +300,7 @@ def _get_metadata_from_response(self, response: Mapping[str, Any] | ChatResponse
                     completion_tokens=response.eval_count,
                 )
             return metadata
-        metadata: dict[str, Any] = {
+        metadata = {
             "model": response.get("model"),
         }