CI: Fix jq to handle missing metadata

[fantix]

Sample JSON losing metadata:

{
  "basename": "edgedb-cli",
  "name": "edgedb-cli",
  "slot": null,
  "version": "6.1.0-dev.1225+a647d8a",
  "version_details": {
    "major": 6,
    "minor": null,
    "patch": 0,
    "prerelease": [
      {
        "phase": "dev",
        "number": 1225
      }
    ],
    "metadata": {}
  },
  "version_key": "6~dev.1225.202412070027nightly.el9",
  "revision": "202412070027nightly.el9",
  "build_date": "1970-01-01T00:00:00+00:00",
  "tags": {},
  "architecture": "aarch64",
  "installref": "edgedb-cli-6.1.0_dev.1225+a647d8a-202412070027nightly.el9.aarch64",
  "installrefs": [
    {
      "ref": "edgedb-cli-6.1.0_dev.1225+a647d8a-202412070027nightly.el9.aarch64",
      "type": null,
      "encoding": null,
      "verification": {}
    }
  ]
}

[msullivan]

Do we have any idea why the json was missing the metadata?

[fantix]

I traced up to https://github.com/edgedb/edgedb-pkg/blob/337eef62f7686750c1bd620705836eb31d0ee2ae/server/process_incoming.py#L1301-L1310 and found myself not knowing enough about the rpm repository stuff.