updates and pin vaultwarden to unstable

modules/homelab/vaultwarden/default.nix

@@ -1,4 +1,4 @@
-{ pkgs, config, lib, ... }:
+{ pkgs, config, lib, unstable_pkgs, ... }:
 
 let
   service = "vaultwarden";
@@ -62,6 +62,7 @@ in
     # enable the vaultwarden service
     services.${service} = {
       enable = true;
+      package = unstable_pkgs.vaultwarden;
       config = {
         DOMAIN = domain;
         ROCKET_ADDRESS = "0.0.0.0";