Upgrade jberet-core from 2.1.1.Final to 2.1.2.Final

release: https://github.com/jberet/jsr352/releases/tag/2.1.2.Final

diff: https://github.com/jberet/jsr352/compare/2.1.1.Final...2.1.2.Final 

There is no major changes in this upgrade; just many smaller upgrades and improvements over the past year.