PLF-5496: Update eXo Platform dependencies to release JCR 1.15.6-GA (PLF 4.0.3)
[maven-release-plugin] prepare release 1.15.6-GA
[maven-release-plugin] prepare for next development iteration
PLF-5496: Update eXo Dependencies for JCR 1.15.6-GA (PLF 4.0.4)