Update app.py

app.py

@@ -10,7 +10,7 @@ openai.api_key = os.getenv("OPENAI_API_KEY")
 # Define the authentication function
 def check_auth(username, password):
     # Get the credentials from the environment variable
-    valid_credentials_str = os.getenv('VALID_CREDENTIALS')
+    valid_credentials_str = os.getenv("VALID_CREDENTIALS")
 
     # Parse the string into a list of tuples
     valid_credentials = json.loads(valid_credentials_str)