Patches : https://review.rdoproject.org/r/q/topic:centos7-8-EOL

Some or our CI jobs are running in CS8 nodes. We need to move them to CS9.

• DLRN-rpmbuild*- : https://review.rdoproject.org/r/c/rdo-jobs/+/52033
• distgit-cbs*- : https://review.rdoproject.org/r/c/config/+/52257
• deps-cbs*- : https://review.rdoproject.org/r/c/config/+/52285
• rdoinfo-create-project: https://review.rdoproject.org/r/c/config/+/52352
• update-buildsys-tags: https://review.rdoproject.org/r/c/config/+/52826
• rdo-send-stable-release: https://review.rdoproject.org/r/c/config/+/52827
• rebuild-fedora-dependencies (we can remove this job): https://review.rdoproject.org/r/c/config/+/52777
• validate-buildsys-tags: https://review.rdoproject.org/r/c/config/+/52826
• config-distgit-mirror-github: https://review.rdoproject.org/r/c/config/+/53008
• tox-linters: https://review.rdoproject.org/r/c/config/+/52934 https://review.rdoproject.org/r/c/config/+/52936
• tox-py36: we should probably move to tox-py39 on cs9 https://review.rdoproject.org/r/c/config/+/52934
• rdoinfo-DLRN-check-centos9: https://review.rdoproject.org/r/c/rdo-jobs/+/52830
• rdo-deps-uc-send-review: https://review.rdoproject.org/r/c/config/+/52917
• rdoinfo-buildsys-tags-update-testing : https://review.rdoproject.org/r/c/config/+/52779
• rdoinfo-buildsys-tags-update-release : https://review.rdoproject.org/r/c/config/+/52779
• rdoinfo-upper-constraints-update: https://review.rdoproject.org/r/c/config/+/52828
• validate-dependencies-rebuilds (to be removed): https://review.rdoproject.org/r/c/config/+/52777