Bump component versions

The following changes were made:
	imagej1.version = 1.49h (latest net.imagej:ij)
	imagej-common.version = 0.9.0 (latest net.imagej:imagej-common)
	imagej-legacy.version = 0.8.4 (latest net.imagej:imagej-legacy)
	imagej-updater.version = 0.6.2 (latest net.imagej:imagej-updater)

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Bump imagej and imagej-ui-swing preemptively

The immediate need for this bump is that we want to make it easier for
users who want to initialize their personal update site.

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