Target/Support version bumps

This is part of the (unmergeable as of now) !96 (closed). These changes are simple yet important enough for me to think that they deserve their own merge request.

I didn't push the changes directly because I haven't worked with the material stuff enough to notice whether anything is breaking or not. For all I can see, the app looks the same and the bumps just added lots more deprecation warnings (which is fine, they can be dealt with over time).