Upgrade fonttools to 4.19.1 am: 4b13d1b318 am: 0b70ed0ef2 am: cb2be8b136

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

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I7620dbb72eac3d6b115ca2f2940862d909dbe7be