Hello,
Faced a similar problem for the package - pldebugger12 (CentOS 7.7, yum)
Repository install from: https://download.postgresql.org/pub/repos/yum/reporpms/EL-7-x86_64/pgdg-redhat-repo-latest.noarch.rpm
Looked for other versions of 7x - also missing
Could fix this matter.
Thank you!
The regards,
Alexey Matveev