Bump mods/mesecons from f718816 to ff87cf3

Bumps [mods/mesecons](https://github.com/minetest-mods/mesecons) from `f718816` to `ff87cf3`.
- [Release notes](https://github.com/minetest-mods/mesecons/releases)
- [Commits](minetest-mods/mesecons@f718816...ff87cf3)

---
updated-dependencies:
- dependency-name: mods/mesecons
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>