[nvim] fix: don't ask for luassert on attach

.config/nvim/lua/plugin/lsp/sumneko_lua.lua

@@ -34,6 +34,7 @@ M.setup = function(opts)
                 -- Make the server aware of Neovim runtime files
                 library =
                     vim.api.nvim_get_runtime_file("", true),
+                checkThirdParty = false,
             },
             -- Do not send telemetry data containing a randomized but
             -- unique identifier