test: close dirs in fs-opendir test

PR-URL: #58855
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Antoine du Hamel <[email protected]>

Author: LiviaMedeiros

test/parallel/test-fs-opendir.js

@@ -229,6 +229,7 @@ for (const bufferSize of ['', '1', null]) {
 async function doAsyncIterInvalidCallbackTest() {
   const dir = await fs.promises.opendir(testDir);
   assert.throws(() => dir.close('not function'), invalidCallbackObj);
+  dir.close();
 }
 doAsyncIterInvalidCallbackTest().then(common.mustCall());
 
@@ -257,6 +258,7 @@ doConcurrentAsyncAndSyncOps().then(common.mustCall());
 {
   const dir = fs.opendirSync(testDir);
   assert.throws(() => dir.read('INVALID_CALLBACK'), /ERR_INVALID_ARG_TYPE/);
+  dir.close();
 }
 
 // Check that concurrent read() operations don't do weird things.