Tidy up imports

test/parallel/test-eventtarget-once-twice.js

@@ -1,6 +1,5 @@
 'use strict';
-const common = require('../common');
-const assert = require('node:assert/strict');
+require('../common');
 const { once } = require('node:events');
 const { test } = require('node:test');
 const { setImmediate } = require('node:timers/promises');
@@ -19,7 +18,7 @@
       et.dispatchEvent(new Event('foo'));
       await setImmediate();
       et.dispatchEvent(new Event('foo'));
     })()
   ]);
 
 });