fix: Update punycode import path

With later Node versions, deprecation warnings began to appear
about changing the import path to avoid using core modules,
instead to use userland modules. This follows the advice for
punycode's most recent version (v2.3.1). This should ideally
be applied for a v3.0.1 tag so a number of active packages
can remove this warning.

index.js

@@ -1,6 +1,6 @@
 "use strict";
 
-const punycode = require("punycode");
+const punycode = require("punycode/");
 const regexes = require("./lib/regexes.js");
 const mappingTable = require("./lib/mappingTable.json");
 const { STATUS_MAPPING } = require("./lib/statusMapping.js");