graphics/py-pillow: Update to 6.2.2

Changelogs since 6.2.0:

https://pillow.readthedocs.io/en/stable/releasenotes/6.2.2.html
https://pillow.readthedocs.io/en/stable/releasenotes/6.2.1.html

PR: 243336
Submitted by: sunpoet
Approved by: koobs (maintainer)
MFH: 2020Q1
Security: 0700e76c-3eb0-11ea-8478-3085a9a95629