Use Linux 6.13

Update flake inputs

nixos/default.nix

@@ -128,6 +128,7 @@
         ncdu
         lshw
         sops
+        nix-tree
       ];
     };
 
@@ -179,11 +180,15 @@
             "steam-run"
             "steam-unwrapped"
           ];
+
+        permittedInsecurePackages = [
+          "electron-31.7.7"
+        ];
       };
 
       overlays = [
         inputs.nur.overlays.default
-        (final: _prev: {
+        (_final: _prev: {
           unstable = import inputs.nixpkgs-unstable {
             inherit (pkgs) system;
             config.allowUnfree = true;
@@ -192,9 +197,13 @@
       ];
     };
 
-    boot.kernel.sysctl = {
-      "net.core.default_qdisc" = "fq";
-      "net.ipv4.tcp_congestion_control" = "bbr";
+    boot = {
+      kernelPackages = pkgs.linuxKernel.packages.linux_6_13;
+
+      kernel.sysctl = {
+        "net.core.default_qdisc" = "fq";
+        "net.ipv4.tcp_congestion_control" = "bbr";
+      };
     };
 
     home-manager = {