Fix error deserializing enum values with flattening Jackson2HashMapper.

This commit makes sure the mapper does not attempt to read type alias when deserializing enums.

Original pull request: #2980
Closes #2979

src/main/java/org/springframework/data/redis/hash/Jackson2HashMapper.java

@@ -177,7 +177,7 @@ public class Jackson2HashMapper implements HashMapper<Object, String, Object> {
 							return false;
 						}
 
-						if (flatten && type.isTypeOrSubTypeOf(Number.class)) {
+						if (flatten && (type.isTypeOrSubTypeOf(Number.class) || type.isEnumType())) {
 							return false;
 						}