chore: remove reference to Ruby build directory

As the `main` branch no longer includes the Ruby build.

Author: wincent

lua/wincent/commandt/health.lua

@@ -6,8 +6,6 @@ local health = vim.health -- after: https://github.com/neovim/neovim/pull/18720
 
 local path = require('wincent.commandt.private.path')
 local lua_build_directory = vim.fn.fnamemodify((path.caller() + '../lib'):normalize(), ':~')
-local ruby_build_directory =
-  vim.fn.fnamemodify((path.caller() + '../../../../ruby/command-t/ext/command-t'):normalize(), ':~')
 
 local function report_info()
   local version = require('wincent.commandt.version')
@@ -16,7 +14,6 @@ local function report_info()
     health.info('This is a prerelease (track the `release` branch for maximum stability)')
   end
   health.info('Lua build directory:\n' .. lua_build_directory)
-  health.info('Ruby build directory:\n' .. ruby_build_directory)
 end
 
 local function check_lua_c_library()