Remove unused import from JdbcChannelMessageStore

Author: artembilan

spring-integration-jdbc/src/main/java/org/springframework/integration/jdbc/store/JdbcChannelMessageStore.java

@@ -51,7 +51,6 @@
 import org.springframework.jdbc.core.JdbcTemplate;
 import org.springframework.jdbc.core.namedparam.MapSqlParameterSource;
 import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
-import org.springframework.jdbc.support.lob.DefaultLobHandler;
 import org.springframework.jdbc.support.lob.LobHandler;
 import org.springframework.jmx.export.annotation.ManagedAttribute;
 import org.springframework.jmx.export.annotation.ManagedMetric;