Changes

With the replacement of Jackrabbit 2 by Jackrabbit Oak as implementation
of the JCR used by Silverpeas, the branch 'master' has been duplicated
in order to keep track of the two versions of Silverpeas 6.4 in dev: one
with Jackrabbit Oak (master) and the another one with Jackrabbit 2
(master-jackrabbit). These two branches will be kept until the release
of version 6.4. So, the pipelines dedicated in the construction of build
versions as well as to release a version of Silverpeas have been updated
in consequence.

Improve the pipeline to construct a build version of Silverpeas Mobile.

Update parent POM to version 1.6-build230503

Update the build version of Silverpeas to 6.4-build230504