test: make node-api/test_buffer/test_finalizer not flaky

PR-URL: nodejs/node#43418
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Michael Dawson <midawson@redhat.com>

test/node-api/test_buffer/test_finalizer.js

@@ -16,6 +16,10 @@ process.on('uncaughtException', common.mustCall((err) => {
       throw new Error('finalizer error');
     }));
   }
+  global.gc(true);
+  await tick(common.platformTimeout(100));
   global.gc();
-  await tick(10);
+  await tick(common.platformTimeout(100));
+  global.gc();
+  await tick(common.platformTimeout(100));
 })().then(common.mustCall());