If you get the error
GPG key at file:///etc/pki/rpm-gpg/RPM-GPG-KEY-elrepo.org (0xBAADAE52) is already installed
The GPG keys listed for the "ELRepo.org Community Enterprise Linux Kernel Repository - el9" repository are already installed but they are not correct for this package.
Check that the correct key URLs are configured for this repository.. Failing package is: kernel-lt-6.1.124-1.el9.elrepo.x86_64
when trying to update from elrepo, run the following, and it will import the correct key to get rid of the error.
rpm --import https://www.elrepo.org/RPM-GPG-KEY-v2-elrepo.org