package/cage: bump to latest upstream version

cage v0.1.1 can't build with wlroots 0.10.1, as it uses
a set of wlroots API that are no longer available.

Moving to latest upstream version fixes the issue.

Also:
- added license file information
- updated license file hash

Signed-off-by: Gilles Talis <gilles.talis@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>