Need newer alsa-ucm-conf 1.2.5.1

Filing seprately to not clutter librem5-base!277 (merged)

@carsten.schoenert This is not super urgent, just in case you're bored: if you want to give backporting the 1.2.5.1-1 from Debian a try that would help a lot. I can test the resulting configuration before uploading.

On top we need https://github.com/alsa-project/alsa-ucm-conf/pull/102