deps: fix shim for v8::Value::IntegerValue()

This was introduced in 48d1335. Previously, values such as
`undefined` would not be coerced properly because `NumberValue()`
returns `NaN` for them.

Refs: #23158

PR-URL: #23898
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Ujjwal Sharma <usharma1998@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: addaleax

deps/v8/src/api.cc

@@ -3901,7 +3901,7 @@ double Value::NumberValue() const {
 
 
 int64_t Value::IntegerValue() const {
-  return NumberValue(Isolate::GetCurrent()->GetCurrentContext())
+  return IntegerValue(Isolate::GetCurrent()->GetCurrentContext())
       .FromMaybe(0);
 }