Upgrade fonttools to 4.18.2 am: c89ead6a8a am: 214df0141a

Original change: https://android-review.googlesource.com/c/platform/external/fonttools/+/1531918

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I72d5425af3231865258139575b5aa7d857d09c7a