Bump mods/signs_lib from `aa5f865` to `b0808a3`

Bumps [mods/signs_lib](https://github.com/mt-mods/signs_lib) from `aa5f865` to `b0808a3`.
- [Release notes](https://github.com/mt-mods/signs_lib/releases)
- [Commits](https://github.com/mt-mods/signs_lib/compare/aa5f865131b61eda0e71308f1a83cd10f1ac7b31...b0808a376afddd270f41e38841b3ee0e23bfeafa)