ingest: failure during `fetch_andersen_lab_repo`

### Current Behavior Over the last month, there's been at least one workflow run per week that fails during `fetch_andersen_lab_repo` with a 403 error. Looks like the [rule](https://github.com/nextstrain/avian-flu/blob/7123c7560501dc3d63fd4edf91461a02dda67d37/ingest/build-configs/ncbi/rules/ingest_andersen_lab.smk#L7-L17) does _not_ have the Snakemake `retries` directive, so the whole workflow fails on this single network error.