let VeloxPromise move-ctor be noexcept (#12182)

Summary:
Pull Request resolved: #12182

It seems like the intention was for the `VeloxPromise` move-ctor to be `noexcept`.

Reviewed By: pedroerp

Differential Revision: D68715056

fbshipit-source-id: 37938e434d519f0302a325f1b25ad84f83e5d8d3

velox/common/future/VeloxPromise.h

@@ -42,7 +42,7 @@ class VeloxPromise : public folly::Promise<T> {
     }
   }
 
-  explicit VeloxPromise(VeloxPromise<T>&& other)
+  explicit VeloxPromise(VeloxPromise<T>&& other) noexcept
       : folly::Promise<T>(std::move(other)),
         context_(std::move(other.context_)) {}