Bump android gradle plugin and kotlin versions

mentioned in commit robUx4/libvlcjni@f0e19651

mentioned in commit robUx4/libvlcjni@b59445db

mentioned in commit robUx4/libvlcjni@8e6561f7

mentioned in commit robUx4/libvlcjni@f32a842e

mentioned in commit robUx4/libvlcjni@8bbdeff3

mentioned in commit robUx4/libvlcjni@4ed7db11

mentioned in commit robUx4/libvlcjni@3af740d8

mentioned in commit robUx4/libvlcjni@400e1908

mentioned in commit robUx4/libvlcjni@050cdc19

mentioned in commit robUx4/libvlcjni@5cd09093

mentioned in merge request !1989 (merged)