deps: silence internal V8 deprecation warning

PR-URL: https://github.com/nodejs/node/pull/52293
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>

common.gypi

@@ -37,7 +37,7 @@
 
     # Reset this number to 0 on major V8 upgrades.
     # Increment by one for each non-official patch applied to deps/v8.
-    'v8_embedder_string': '-node.7',
+    'v8_embedder_string': '-node.8',
 
     ##### V8 defaults for Node.js #####
 

deps/v8/src/base/optional.h

@@ -16,7 +16,7 @@ namespace base {
 
 // These aliases are deprecated, use std::optional directly.
 template <typename T>
-using Optional [[deprecated]] = std::optional<T>;
+using Optional = std::optional<T>;
 
 using std::in_place;
 using std::make_optional;