/hpo/genes endpoint does not return HGNC ID

[holtgrewe]

Describe the bug
The /hpo/genes endpoint does not return the HGNC ID of genes.

To Reproduce
Steps to reproduce the behavior:

# curl http://127.0.0.1:8080/hpo/genes?gene_symbol=TGDS | jq '.'
{
  "version": {
    "hpo": "2023-04-05",
    "viguno": "0.1.0"
  },
  "query": {
    "gene_id": null,
    "gene_symbol": "TGDS",
    "match_": null,
    "max_results": 100,
    "hpo_terms": false
  },
  "result": [
    {
      "gene_ncbi_id": 23483,
      "gene_symbol": "TGDS"
    }
  ]
}

Expected behavior
The HGNC ID should be written out.

Screenshots
N/A

Additional context
N/A