Fixes typecheck (#5447)

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Author: arcanis

packages/acceptance-tests/pkg-tests-specs/sources/features/configuration.test.ts

@@ -1,4 +1,4 @@
-import {Filename, ppath, xfs} from '@yarnpkg/fslib';
+import {Filename, PortablePath, ppath, xfs} from '@yarnpkg/fslib';
 
 describe(`Features`, () => {
   describe(`Configuration`, () => {