Satellite upgrade from 6.15 to 6.16 failed with Curl error (77): Problem with the SSL CA cert (path? access rights?).

Issue

• Upgrading satellite from 6.15 to 6.16 fails with the foloowing error:

  E, [2025-07-17 11:18:20-0400 #13245] ERROR -- : Failed executing dnf     --enablerepo=rhel-8-for-x86_64-baseos-rpms --enablerepo=rhel-8-for-x86_64-appstream-rpms     --enablerepo=satellite-maintenance-6.16-for-rhel-8-x86_64-rpms -y --disableplugin=foreman-protector update rubygem-foreman_maintain satellite-maintain, exit status 1:
  Updating Subscription Management repositories.
  Red Hat Satellite Maintenance 6.16 for RHEL 8 x 0.0  B/s |   0  B     00:00
  Errors during downloading metadata for repository 'satellite-maintenance-6.16-for-rhel-8-x86_64-rpms':
  - Curl error (77): Problem with the SSL CA cert (path? access rights?) for https://cdn.redhat.com/content/dist/layered/rhel8/x86_64/sat-maintenance/6.16/os/repodata/repomd.xml [error setting certificate verify l ocations:
  CAfile: %(ca_cert_dir)sredhat-uep.pem
  CApath: none]
  Error: Failed to download metadata for repo 'satellite-maintenance-6.16-for-rhel-8-x86_64-rpms': Cannot download repomd.xml: Curl error (77): Problem with the SSL CA cert (path? access rights?) for       https://cdn.redhat.com/content/dist/layered/rhel8/x86_64/sat-maintenance/6.16/os/repodata/repomd.xml [error setting certificate verify locations:
  CAfile: %(ca_cert_dir)sredhat-uep.pem
  CApath: none] (ForemanMaintain::Error::ExecutionError)