CI: Install EPEL packages via full URL to support running tests on real RHEL

Miro Hrončokrequested to merge
hroncok/centos_rpms_pyproject-rpm-macros:c9s-epel-rhel into c9s

Merge Request Required Information

Summary of Changes

Approved Bugzilla Ticket

All submissions to CentOS Stream must reference an approved ticket in Red Hat Bugzilla. Please follow the CentOS Stream contribution documentation for how to file this ticket and have it approved.

Edited by Miro Hrončok

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