pom-scijava: use the just-released nar-maven-plugin version 3.0.0
pom-scijava: use the just-released nar-maven-plugin version 3.0.0

Signed-off-by: Johannes Schindelin <53fb8db7833fca1e1746dd8592f61048d350f64c@gmx.de>

scijava/scijava-common