nixops: fix openssl permitted package

nixops/desktop.nix

@@ -31,7 +31,7 @@ in
     };
   };
   nixpkgs.config.permittedInsecurePackages = [
-    "openssl-1.1.1t"
+    "openssl-1.1.1u"
   ];
 
   networking.hostName = host;