upload: Move confirmation threshold from 3 to 5 commits

Change-Id: I7275d195cf04f02694206b9f838540b0228ff5e1

subcmds/upload.py

@@ -20,7 +20,7 @@ from command import InteractiveCommand
 from editor import Editor
 from error import UploadError
 
-UNUSUAL_COMMIT_THRESHOLD = 3
+UNUSUAL_COMMIT_THRESHOLD = 5
 
 def _ConfirmManyUploads(multiple_branches=False):
   if multiple_branches: