POM: update parent to pom-scijava 29.0.0-beta-2
POM: update parent to pom-scijava 29.0.0-beta-2

This updates dependency versions across the board, and removes
the no-longer-needed jitpack and kotlin-eap repositories, since
they are now proxied by the SciJava public group.

scenerygraphics/SciView,scenerygraphics/SciView