unifi-controller: use hash and remove blank knownVulnerabilities (#356993)

pkgs/by-name/un/unifi/package.nix

@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
   # see https://community.ui.com/releases / https://www.ui.com/download/unifi
   src = fetchurl {
     url = "https://dl.ui.com/unifi/${version}/unifi_sysvinit_all.deb";
-    sha256 = "sha256-004ZJEoj23FyFEBznqrpPzQ9E6DYpD7gBxa3ewSunIo=";
+    hash = "sha256-004ZJEoj23FyFEBznqrpPzQ9E6DYpD7gBxa3ewSunIo=";
   };
 
   nativeBuildInputs = [ dpkg ];
@@ -42,6 +42,5 @@ stdenv.mkDerivation rec {
       globin
       patryk27
     ];
-    knownVulnerabilities = [ ];
   };
 }