Reconcile types of two queryObjects functions

Page and ExecutionContext both have a queryObjects function. One
just calls the other internally in in Puppeteer. This changes the
ExecutionContext version to wrap a generic type so that its
signature matches the version in Page.

src/ExecutionContext.re

@@ -22,5 +22,5 @@ external name: t => string = "";
  */
 [@bs.send]
 external queryObjects:
-  (t, ~prototypeHandle: JSHandle.t('a)) => JSHandle.t(array(Js.t({..}))) =
+  (t, ~prototypeHandle: JSHandle.t('a)) => JSHandle.t(array('b)) =
   "";