Revert "Release to rely on imglib2 beta9 version"

This reverts commit 4b91118f2e73a5e05572f5e496fb97eefefa26d1.

Unfortunately, this commit did not bump the project version, so created
a POM with bogus version 1.48 (i.e., not matching the actually-deployed
1.48). We revert the commit so there is at least some record that this
was unintended.