Update dependencies
Update dependencies

Spring -> 4.3.7
Jetty -> 9.4.2
Mockito -> 2.7.17
SLF4J -> 1.7.24
Log4j2 -> 2.8.1
OpenJson -> 1.0.1
Dropwizard Metrics -> 3.1.3

dashorst/wicket,mosoft521/wicket,apache/wicket,dashorst/wicket,aldaris/wicket,bitstorm/wicket,bitstorm/wicket,mosoft521/wicket,bitstorm/wicket,dashorst/wicket,apache/wicket,bitstorm/wicket,selckin/wicket,apache/wicket,selckin/wicket,aldaris/wicket,aldaris/wicket,apache/wicket,apache/wicket,bitstorm/wicket,mosoft521/wicket,mosoft521/wicket,aldaris/wicket,selckin/wicket,selckin/wicket,dashorst/wicket,aldaris/wicket,dashorst/wicket,selckin/wicket,mosoft521/wicket