Bump spectator_mode from `3648371` to `487307f`

Bumps [spectator_mode](https://github.com/minetest-mods/spectator_mode) from `3648371` to `487307f`.
- [Release notes](https://github.com/minetest-mods/spectator_mode/releases)
- [Commits](https://github.com/minetest-mods/spectator_mode/compare/36483716ed29699f20b3c7a704a1ab8023989f49...487307fc8fa7b362ac642f930817f0ec85424659)

spectator_mode @ 487307fc

-Subproject commit 36483716ed29699f20b3c7a704a1ab8023989f49
+Subproject commit 487307fc8fa7b362ac642f930817f0ec85424659