Bump base image to newer ubuntu to get newer LLVM

[aaomidi]

Hardware transcoding in the docker container does not work for 7000+ AMD GPUs due to the LLVM being too old.

libva info: VA-API version 1.16.0
libva info: User environment variable requested driver 'radeonsi'
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/radeonsi_drv_video.so
libva info: Found init function __vaDriverInit_1_16
'gfx1100' is not a recognized processor for this target (ignoring processor)
'gfx1100' is not a recognized processor for this target (ignoring processor)

This is similar to this bug: https://github.com/ValveSoftware/steam-for-linux/issues/9077