Bump mods/basic_signs from `275d3e7` to `6f4f80b`

Bumps [mods/basic_signs](https://github.com/mt-mods/basic_signs) from `275d3e7` to `6f4f80b`.
- [Release notes](https://github.com/mt-mods/basic_signs/releases)
- [Commits](https://github.com/mt-mods/basic_signs/compare/275d3e720707f3614a5ca54430fe2a21f7bffa52...6f4f80bdc6c153c3e7745f182c5e1f2e30f14b50)

basic_signs @ 6f4f80bd

-Subproject commit 275d3e720707f3614a5ca54430fe2a21f7bffa52
+Subproject commit 6f4f80bdc6c153c3e7745f182c5e1f2e30f14b50