chore: update hass image

Signed-off-by: aottr <[e-mail]>

modules/nixos/server/home-assistant.nix

···
       volumes = [ "home-assistant:/config" ];
       environment.TZ = "Europe/Paris";
       # Note: The image will not be updated on rebuilds, unless the version label changes
-      image = "ghcr.io/home-assistant/home-assistant:2025.8.3";
+      image = "ghcr.io/home-assistant/home-assistant:2026.1.2";
       autoStart = true;
       extraOptions = [ 
         "--privileged"