Update crew.py

crew.py

@@ -7,7 +7,7 @@ from crewai_tools import (
 )
 from phoenix.otel import register
 
-PHOENIX_CLIENT_HEADERS = f"api_key={os.environ["PHOENIX_API_KEY"]}"
+PHOENIX_CLIENT_HEADERS = "api_key=" + os.environ["PHOENIX_API_KEY"]
 PHOENIX_COLLECTOR_ENDPOINT = "https://app.phoenix.arize.com"
 
 tracer_provider = register(