Update bytes to GB with bitshift (#6886)

utils/general.py

@@ -223,11 +223,12 @@ def emojis(str=''):
 
 def file_size(path):
     # Return file/dir size (MB)
+    mb = 1 << 20  # bytes to MiB (1024 ** 2)
     path = Path(path)
     if path.is_file():
-        return path.stat().st_size / 1E6
+        return path.stat().st_size / mb
     elif path.is_dir():
-        return sum(f.stat().st_size for f in path.glob('**/*') if f.is_file()) / 1E6
+        return sum(f.stat().st_size for f in path.glob('**/*') if f.is_file()) / mb
     else:
         return 0.0