Upgrade fonttools from 3.28.0 to 3.31.0.
Ran `tools/external_updater/updater.sh update fonttools`. Bug: N/A Test: builds Change-Id: I59a0dfbf4585d3a95d2120d49730321b84c884ff
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Ran `tools/external_updater/updater.sh update fonttools`. Bug: N/A Test: builds Change-Id: I59a0dfbf4585d3a95d2120d49730321b84c884ff
mentioned in commit f18e1660
mentioned in commit fac7ac91
mentioned in commit 9c5c0a41