Update app.py

app.py

@@ -1,6 +1,6 @@
 import spaces
 import sys
-
+import os
 os.system(f"git clone https://github.com/Curt-Park/yolo-world-with-efficientvit-sam.git")
 cwd0 = os.getcwd()
 cwd1 = os.path.join(cwd0, "yolo-world-with-efficientvit-sam")