remove redundant import json

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: ahmedmuhsin

python/packages/azurefunctions/agent_framework_azurefunctions/_workflow.py

@@ -719,8 +719,6 @@ def run_workflow_orchestrator(
                     # Durable Functions may return a JSON string; parse it if so
                     if isinstance(raw_response, str):
                         try:
-                            import json
-
                             raw_response = json.loads(raw_response)
                             logger.debug("Parsed JSON string response to: %s", type(raw_response).__name__)
                         except (json.JSONDecodeError, TypeError):