Revise `LobHandler` usage in JDBC module

[artembilan]

\spring-integration\spring-integration-jdbc\src\test\java\org\springframework\integration\jdbc\config\JdbcMessageStoreParserTests.java:81: warning: [deprecation] LobHandler in org.springframework.jdbc.support.lob has been deprecated
                assertThat(ReflectionTestUtils.getField(store, "lobHandler")).isEqualTo(context.getBean(LobHandler.class));
                                                                                                        ^
\spring-integration\spring-integration-jdbc\src\test\java\org\springframework\integration\jdbc\store\channel\AbstractJdbcChannelMessageStoreTests.java:138: warning: [deprecation] LobHandler in org.springframework.jdbc.support.lob has been deprecated
                        private LobHandler lobHandler = new DefaultLobHandler();
                                ^
\spring-integration\spring-integration-jdbc\src\test\java\org\springframework\integration\jdbc\store\channel\AbstractJdbcChannelMessageStoreTests.java:138: warning: [deprecation] DefaultLobHandler in org.springframework.jdbc.support.lob has been deprecated
                        private LobHandler lobHandler = new DefaultLobHandler();
                                                            ^
3 warnings