Bump component versions

The following changes were made:
	imagej-legacy.version = 0.5.9 (latest net.imagej:imagej-legacy)

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Bump imagej preemptively to fourth release candiate

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>