Remove unused Transactional import

Signed-off-by: Antoine Rey <antoine.rey@free.fr>

src/main/java/org/springframework/samples/petclinic/owner/OwnerRepository.java

@@ -23,7 +23,6 @@ import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.Query;
-import org.springframework.transaction.annotation.Transactional;
 
 /**
  * Repository class for <code>Owner</code> domain objects All method names are compliant