Bug#1092603: Please enable firmware Zstd compression

[Raul Tambre]

In my case I have to install firmware from linux-firmware myself due to having 
very new hardware.
So not directly applicable to Debian's own shipped firmware but for some users 
it's still relevant.
This actually has been enabled in 
<https://salsa.debian.org/kernel-team/linux/-/commit/dfee9b4caabb60d008616f0a2875d069d4c82ea2>
 but the closer was missed before the 6.13.3-1~exp1 upload.