blockbook: mark as broken

Co-authored-by: 1000101 <b1000101@pm.me>

pkgs/servers/blockbook/default.nix

@@ -65,5 +65,8 @@ buildGoModule rec {
     license = licenses.agpl3;
     maintainers = with maintainers; [ mmahut _1000101 ];
     platforms = platforms.unix;
+    # go dependency tecbot/gorocksdb requires rocksdb 5.x but nixpkgs has only rocksdb 6.x
+    # issue in upstream can be tracked here: https://github.com/trezor/blockbook/issues/617
+    broken = true;
   };
 }