Replace chrony with systemd-timesyncd

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/0fc9fca9c8d43edd79d33fea0dd8409d7c4580f4' (2023-01-02)
  → 'github:NixOS/nixpkgs/a518c77148585023ff56022f09c4b2c418a51ef5' (2023-01-05)

configuration.nix

@@ -83,7 +83,7 @@ with pkgs;
 
   # Set timezone and synchronize NTP
   time.timeZone = "Europe/Brussels";
-  services.chrony.enable = true;
+  services.timesyncd.enable = true;
 
   # NixOS version
   system.stateVersion = "22.05";

flake.lock

@@ -38,11 +38,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1672617983,
+        "lastModified": 1672953546,
-        "narHash": "sha256-68WDiCBs631mbDDk4UAKdGURKcsfW6hjb7wgudTAe5o=",
+        "narHash": "sha256-oz757DnJ1ITvwyTovuwG3l9cX6j9j6/DH9eH+cXFJmc=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "0fc9fca9c8d43edd79d33fea0dd8409d7c4580f4",
+        "rev": "a518c77148585023ff56022f09c4b2c418a51ef5",
         "type": "github"
       },
       "original": {