Remove unused imports.

Signed-off-by: Tran Ngoc Nhan <[email protected]>
Closes #3968

Author: ngocnhan-tran1996

spring-data-jpa/src/main/java/org/springframework/data/jpa/repository/support/CrudMethodMetadataPostProcessor.java

@@ -20,7 +20,6 @@
 
 import java.lang.reflect.Method;
 import java.util.HashSet;
-import java.util.Optional;
 import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;