src: remove unused using declarations async_wrap

Backport-PR-URL: #19253
PR-URL: #18893
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Minwoo Jung <minwoo@nodesource.com>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>

src/async_wrap.cc

@@ -26,9 +26,7 @@
 #include "v8.h"
 #include "v8-profiler.h"
 
-using v8::Array;
 using v8::Context;
-using v8::Float64Array;
 using v8::Function;
 using v8::FunctionCallbackInfo;
 using v8::FunctionTemplate;
@@ -47,7 +45,6 @@ using v8::PropertyCallbackInfo;
 using v8::RetainedObjectInfo;
 using v8::String;
 using v8::Symbol;
-using v8::TryCatch;
 using v8::Undefined;
 using v8::Value;