Fix failing tests

lua/cmp/utils/async.lua

@@ -51,20 +51,5 @@ async.dedup = function()
   end
 end
 
----Wiat for callback.
----@param runner fun(done: function)
----@param timeout number
----@return any
-async.sync = function(runner, timeout)
-  local done = false
-  local res = runner(function()
-    done = true
-  end)
-  vim.wait(timeout or 1000, function()
-    return done
-  end, 100, false)
-  return res
-end
-
 return async