package/libbluray: bump version to 1.2.0

Changelog:
https://code.videolan.org/videolan/libbluray/-/blob/master/ChangeLog



Updated download URL.

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>