Github workflow: Fix parsing of GraphQL response JSON

While #12998 fixed the query string, it neglected to address
presence of the old `githubRepository` field name in the reply.  This
resulted in the job throwing an error:

`jq: error (at ./artifacts/reply.json:0): Cannot iterate over null`

However, the job did preserve an artifacts archive containing the new
response data.  As a test for the fix in this commit, I ran the
raw response data through the corrected jq command-line.  This
confirmed the change by properly parsing the data as expected by
the workflow.

Signed-off-by: Chris Evich <cevich@redhat.com>

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