Update rusttype requirement from 0.8.3 to 0.9.0
Update rusttype requirement from 0.8.3 to 0.9.0

Updates the requirements on rusttype to permit the latest version.

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
CryZe/livesplit-core,CryZe/livesplit-core