Add prerelease of rhel 8.7 and 9.1

Victor Tosorequested to merge
victortoso/osinfo-db:rhel-prereleases into master

Hi,

I more or less followed the changes done for rhel 8.5 prerelease in !340 (merged) Not sure if anything else is needed for a prerelease?

Cheers,

Edited by Victor Toso

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