deps: update V8 to 6.1.534.42
Refs: https://github.com/v8/v8/compare/6.1.534.38...6.1.534.42
/cc @nodejs/v8
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines
Affected core subsystem(s)
V8