Bump mods/signs_lib from `14efa6e` to `60d67af`

Dependabotrequested to merge
dependabot/submodules/mods/signs_lib-60d67af into technicworld

Bumps mods/signs_lib from 14efa6e to 60d67af.

Commits
  • 60d67af force all signs into the sign group
  • 4dbfbec remove sign entity if sign is gone (due to voxelmanip or such) (#9)
  • See full diff in compare view

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