fix: force overriding environment variables from .env files (#89)

examples/foundational/11-sound-effects.py

@@ -23,7 +23,7 @@ from typing import AsyncGenerator
 from runner import configure
 
 from dotenv import load_dotenv
-load_dotenv()
+load_dotenv(override=True)
 
 logging.basicConfig(format=f"%(levelno)s %(asctime)s %(message)s")
 logger = logging.getLogger("dailyai")