krb5: use openssl_1_1

pkgs/top-level/all-packages.nix

@@ -18714,6 +18714,8 @@ with pkgs;
 
   krb5 = callPackage ../development/libraries/kerberos/krb5.nix {
     inherit (buildPackages.darwin) bootstrap_cmds;
+    # TODO: can be removed once we have 1.20
+    openssl = openssl_1_1;
   };
   krb5Full = krb5;
   libkrb5 = krb5.override { type = "lib"; };