`remote.download_concurrency` gets passed to `bandersnatch` and now it can be `None` with this [change](https://github.com/pulp/pulpcore/pull/1410/), which breaks syncing. Update to new method.
remote.download_concurrencygets passed tobandersnatchand now it can beNonewith this change, which breaks syncing. Update to new method.