cli-node: removed unused mock-fs from Lockfile test

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/cli-node/src/monorepo/Lockfile.test.ts

@@ -14,7 +14,6 @@
  * limitations under the License.
  */
 
-import mockFs from 'mock-fs';
 import { Lockfile } from './Lockfile';
 
 const LEGACY_HEADER = `# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
@@ -31,10 +30,6 @@ __metadata:
 `;
 
 describe('New Lockfile', () => {
-  afterEach(() => {
-    mockFs.restore();
-  });
-
   describe('diff', () => {
     const lockfileLegacyA = Lockfile.parse(`${LEGACY_HEADER}
 a@^1: