[interop][SwiftToCxx] actor tests require Concurrency

Author: hyp

test/Interop/SwiftToCxx/class/swift-actor-execution.cpp

@@ -20,6 +20,8 @@
 
 // REQUIRES: executable_test
 
+// REQUIRES: concurrency
+
 #include <assert.h>
 #include "actor.h"
 #include <cstdio>

test/Interop/SwiftToCxx/class/swift-actor-in-cxx.swift

@@ -9,6 +9,8 @@
 
 // RUN: %check-interop-cxx-header-in-clang(%t/actor-evo.h)
 
+// REQUIRES: concurrency
+
 @_expose(Cxx)
 public final actor ActorWithField {
   var field: Int64