fix: update remaining import paths in volume.test.ts

Co-authored-by: streamich <[email protected]>

Author: Copilot

src/node/__tests__/volume.test.ts

@@ -4,8 +4,8 @@ import { Link } from '../../core';
 import Stats from '../Stats';
 import Dirent from '../Dirent';
 import { Volume, StatWatcher } from '../volume';
-import hasBigInt from './hasBigInt';
-import { tryGetChild, tryGetChildNode } from './util';
+import hasBigInt from '../../__tests__/hasBigInt';
+import { tryGetChild, tryGetChildNode } from '../../__tests__/util';
 import { genRndStr6 } from '../util';
 import queueMicrotask from '../../queueMicrotask';
 import { constants } from '../../constants';