Is it an error that this says "fedora" ?
I have: pgdg-redhat-repo-42.0-11.noarch
[pgdg13-source-updates-testing]
name=PostgreSQL 13 for RHEL/CentOS $releasever - $basearch - Source updates testing
failovermethod=priority
baseurl=https://download.postgresql.org/pub/repos/yum/srpms/testing/13/fedora/fedora-$releasever-$basearch
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-PGDG