updated code for PreAuthorize role

src/main/java/net/gepafin/tendermanagement/repositories/UserRepository.java

@@ -6,6 +6,6 @@ import org.springframework.data.jpa.repository.JpaRepository;
 import java.util.Optional;
 
 public interface UserRepository extends JpaRepository<UserEntity, Long> {
-    UserEntity findByEmail(String email);
-    boolean existsByEmail(String email);
+    Optional<UserEntity> findByEmailIgnoreCase(String email);
+    boolean existsByEmailIgnoreCase(String email);
 }