Bump i3 from `c8d6312` to `734b09b`

Bumps [i3](https://github.com/minetest-mods/i3) from `c8d6312` to `734b09b`.
- [Release notes](https://github.com/minetest-mods/i3/releases)
- [Commits](https://github.com/minetest-mods/i3/compare/c8d631277292f4a7c4ee20afd5c131420ef3300d...734b09b69f6080e91d4c439e88af42f6109983b0)

i3 @ 734b09b6

-Subproject commit c8d631277292f4a7c4ee20afd5c131420ef3300d
+Subproject commit 734b09b69f6080e91d4c439e88af42f6109983b0