hosts/laptop: use the xanmod kernel

Originally I used to use the latest standard kernel, however after 6.11 it would consistently fail large Nix evals. I could not determine the root cause but I did notice that my zram powered swap wouldn't fill up entirely, and yet oom-killer would fire.

So why the switch? I'm honestly interested in the performance patches, and I made sure to check that my system can still evaluate. Thankfully, it does! Regenerating a `nix-index` database used to fail with the latest kernel, but with the latest xanmod it does not. This is a good sign and as a result im merging in.

hosts/laptop/configuration.nix

@@ -1,4 +1,5 @@
 {
+  pkgs,
   ...
 }:
 {
@@ -16,6 +17,9 @@
       hosts.providers.stevenblack.enable = true;
     };
 
+    # Use the latest xanmod kernel, mainly for the Clear Linux patches
+    boot.kernelPackages = pkgs.linuxPackages_xanmod_latest;
+
     # Enable a desktop environment
     my.desktops.sway.enable = true;