repl: avoid deprecated require.extensions in tab completion

PR-URL: #58653
Fixes: #58641
Reviewed-By: Ethan Arrowood <ethan@arrowood.dev>
Reviewed-By: Dario Piotrowicz <dario.piotrowicz@gmail.com>
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: gulbaki

lib/repl.js

@@ -1340,7 +1340,7 @@ function complete(line, callback) {
     filter = completeOn;
     if (this.allowBlockingCompletions) {
       const subdir = match[2] || '';
-      const extensions = ObjectKeys(this.context.require.extensions);
+      const extensions = ObjectKeys(CJSModule._extensions);
       const indexes = ArrayPrototypeMap(extensions,
                                         (extension) => `index${extension}`);
       ArrayPrototypePush(indexes, 'package.json', 'index');