Bump upstream v8 version to 5.7.492.65

ignisf · ignisf · commit 40ee27d1c5e7 · 2017-03-29T09:29:10.000+03:00
diff --git a/lib/libv8/version.rb b/lib/libv8/version.rb
@@ -1,3 +1,3 @@
 module Libv8
-  VERSION = "5.6.326.50.0beta1"
+  VERSION = "5.7.492.65.0beta1"
 end
diff --git a/vendor/depot_tools b/vendor/depot_tools
@@ -1 +1 @@
-Subproject commit c5b4af697b4018fe31806c687255971fd5124aa3
+Subproject commit af0fd4eb99437a7a914d26d2fca409fc3547e674
