Upgrade fonttools to 4.19.1 am: 4b13d1b318 am: 0b70ed0ef2

Original change: https://android-review.googlesource.com/c/platform/external/fonttools/+/1564513

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ide2ab36febc7932d1f967e11c2c4a89fa4a3c884