/usr/share/lua/5.3/dkjson.lua is in lua-dkjson 2.5-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/lua/5.3/../5.1/dkjson.lua
/usr/share/lua/5.3/../5.1/dkjson.lua