Bump signs_lib from `e66863d` to `8aafe66`

Bumps [signs_lib](https://github.com/mt-mods/signs_lib) from `e66863d` to `8aafe66`.
- [Release notes](https://github.com/mt-mods/signs_lib/releases)
- [Commits](https://github.com/mt-mods/signs_lib/compare/e66863d1156e3e18be915ee4cbf6fc8659b0027b...8aafe6608cba8a95e792efb973cb8fc5d0f1e44e)