Fix const_get in qa/ code

QA.const_get("QA::#{version}::Strategy") was really (accidentally?)
relying on the QA::EE::Strategy being inherited. So might as well switch
it to Object.const_get.

qa/qa/runtime/release.rb

@@ -19,7 +19,7 @@ module QA
       end
 
       def strategy
-        QA.const_get("QA::#{version}::Strategy", false)
+        Object.const_get("QA::#{version}::Strategy", false)
       end
 
       def self.method_missing(name, *args)