Log Message:
py-phonenumbers: updated to 8.12.31

What's new in 8.12.24

Merge to upstream commit e9d8d84f531b; relevant code changes:

Updated As-You-Type-Formatter to exclude patterns where some digits would be \ 
dropped in the output. This also fixes the bug where an extra country code is \ 
added in some cases to the user's output. b/183053929