Bump component versions

The following changes were made:
	ij1-patcher.version = 0.8.1 (latest net.imagej:ij1-patcher)
	imagej-legacy.version = 0.5.8 (latest net.imagej:imagej-legacy)
	imagej-plugins-commands.version = 0.2.1 (latest net.imagej:imagej-plugins-commands)

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