feat: update flake dependencies and add openssh service config

nixos/tako/services/default.nix

@@ -22,6 +22,7 @@
     ./tailscale.nix
     # ./headscale.nix
     # ./shitpost.nix
+    ./openssh.nix
   ];
   services = {
     nix-serve = {

nixos/tako/services/openssh.nix

@@ -0,0 +1,8 @@
+{...}: {
+  services.openssh = {
+    enable = true;
+    passwordAuthentication = false;
+    permitRootLogin = "prohibit-password";
+    pubKeyAuthentication = true;
+  };
+}