src: fix integer overflow in GetNow

PR-URL: #22214
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Bradley Farias <bradley.meck@gmail.com>
Reviewed-By: Matheus Marchini <matheus@sthima.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

src/env.cc

@@ -536,7 +536,7 @@ Local<Value> Environment::GetNow() {
   CHECK_GE(now, timer_base());
   now -= timer_base();
   if (now <= 0xffffffff)
-    return Integer::New(isolate(), static_cast<uint32_t>(now));
+    return Integer::NewFromUnsigned(isolate(), static_cast<uint32_t>(now));
   else
     return Number::New(isolate(), static_cast<double>(now));
 }