update settings for nixos 23.05

Fix the following error:
```
trace: warning: The option `services.openssh.permitRootLogin' defined in `/nix/store/l0n3297c7znfapx32a6av1c26yj042j4-source/profiles/server.nix' has been renamed to `services.openssh.settings.PermitRootLogin'.
trace: warning: The option `services.openssh.passwordAuthentication' defined in `/nix/store/l0n3297c7znfapx32a6av1c26yj042j4-source/profiles/server.nix' has been renamed to `services.openssh.settings.PasswordAuthentication'.
```

1 files changed, 4 insertions, 2 deletions

diff --git a/profiles/server.nix b/profiles/server.nix
index 5f1ce10..47cdc17 100644
--- a/profiles/server.nix
+++ b/profiles/server.nix
@@ -9,8 +9,10 @@
 
   services.openssh = {
     enable = true;
-    permitRootLogin = "yes";
-    passwordAuthentication = false;
+    settings = {
+      PermitRootLogin = "yes";
+      PasswordAuthentication = false;
+    };
   };
 
   networking.firewall.allowedTCPPorts = [ 22 ];