varnish/modules: update/clean-up

pkgs/servers/varnish/modules.nix

···
     version = "0.15.1";
     sha256 = "1lwgjhgr5yw0d17kbqwlaj5pkn70wvaqqjpa1i0n459nx5cf5pqj";
   };
-  modules20 = common {
-    version = "0.20.0";
-    sha256 = "sha256-3eH3qCa24rWqYXsTTDmm/9LjBMxcxUuozuRzZ3e8cUo=";
-  };
-  modules22 = common {
-    version = "0.22.0";
-    sha256 = "sha256-eoa6i6AuOS4pxQKA/lbJnwFc39cRiLqnBSpPM4Oitrc=";
+  modules23 = common {
+    version = "0.23.0";
+    sha256 = "sha256-Dd1pLMmRC59iRRpReDeQJ8Sv00ojb8InvaMrb+iRv4I=";
   };
 }

pkgs/servers/varnish/packages.nix

···
   };
   varnish74Packages = rec {
     varnish = varnish74;
-    modules = (callPackages ./modules.nix { inherit varnish; }).modules22;
+    modules = (callPackages ./modules.nix { inherit varnish; }).modules23;
   };
 }