Explicitely set findbugs plugin version for jdk 8 compatibility
Explicitely set findbugs plugin version for jdk 8 compatibility

Otherwise jenkins used an older plugin which failed the build when
run with jdk 8.

xfrendx/kryo,EsotericSoftware/kryo,xfrendx/kryo,EsotericSoftware/kryo,magro/kryo,EsotericSoftware/kryo,EsotericSoftware/kryo,magro/kryo