Upgrade six to 1.16.0 am: 7a202e1064 am: 3e24db96b5

Original change: https://android-review.googlesource.com/c/platform/external/python/six/+/3162722

Change-Id: I5e323c439bff666907b08228dc34ac97e7413f90
Signed-off-by: Automerger Merge Worker <[email protected]>