deps: silence V8's warning on CompileFunction

We are not ready to migrate yet.

Refs: nodejs/node-v8#214

PR-URL: #40907
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

common.gypi

@@ -36,7 +36,7 @@
 
     # 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.5',
+    'v8_embedder_string': '-node.6',
 
     ##### V8 defaults for Node.js #####
 

deps/v8/include/v8-script.h

@@ -650,7 +650,6 @@ class V8_EXPORT ScriptCompiler {
    * It is possible to specify multiple context extensions (obj in the above
    * example).
    */
-  V8_DEPRECATED("Use CompileFunction")
   static V8_WARN_UNUSED_RESULT MaybeLocal<Function> CompileFunctionInContext(
       Local<Context> context, Source* source, size_t arguments_count,
       Local<String> arguments[], size_t context_extension_count,