bodhi_backend: override repomd URLs for EPEL-10.0
    
    EPEL-10.0 needs an override to use 10 in the repomd URL instead of 10.0.
    We'll need to move this forward over time to stay on the leading minor
    version, allowing trailing minor versions to use the default repomd URL.
    
    Signed-off-by: Carl George <carlwgeorge@gmail.com>