Remove 23.11 support, add 24.11

This also fixes this CI bug https://github.com/astro/microvm.nix/actions/runs/13838668115/job/38720170380#step:5:1353

Author: SuperSandro2000

.github/workflows/prebuilt-23.11.yml renamed to .github/workflows/prebuilt-24.11.yml

@@ -1,4 +1,4 @@
-name: "prebuilt-23.11"
+name: "prebuilt-24.11"
 
 on:
   workflow_dispatch: # allows manual triggering
@@ -18,4 +18,4 @@ jobs:
       with:
         name: microvm
         authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
-    - run: nix build -L .#prebuilt --override-input nixpkgs github:nixos/nixpkgs/release-23.11
+    - run: nix build -L .#prebuilt --override-input nixpkgs github:nixos/nixpkgs/release-24.11

doc/src/cpu-emulation.md

@@ -56,7 +56,7 @@ settings:
           };
           environment.systemPackages = with pkgs; [ cowsay htop ];
           services.getty.autologinUser = "root";
-          system.stateVersion = "23.11";
+          system.stateVersion = "24.11";
         }
       ];
     };