test: change object assign by spread operator

change object assign by spread operator in test-require-symlink.js
PR-URL: https://github.com/nodejs/node/pull/30438
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

test/parallel/test-require-symlink.js

@@ -78,7 +78,7 @@ function test() {
 
   // Also verify that symlinks works for setting preserve via env variables
   const childEnv = spawn(node, [linkScript], {
-    env: Object.assign({}, process.env, { NODE_PRESERVE_SYMLINKS: '1' })
+    env: { ...process.env, NODE_PRESERVE_SYMLINKS: '1' }
   });
   childEnv.on('close', function(code, signal) {
     assert.strictEqual(code, 0);