Note: Talos can be still run under `Firecracker`, support for
Firecracker was only removed for `talosctl cluster create`.
Reason:
* code is untested/unmaintained, and probably doesn't work correctly
* firecracker Go SDK pulls lots of dependencies and it blocks CNI Go
module update
Bonus: `talosctl-linux-amd64` shrinks by 2 MiB.
Signed-off-by: Andrey Smirnov <andrey.smirnov@talos-systems.com>