Fix source repo metalinks
    
    Reference: see https://sigs.centos.org/guide/delivery/#centos-stream-9-and-above_1
    ```
    ❯ curl 'https://mirrors.centos.org/metalink?repo=unknown&arch=x86_64' -s | grep hyperscale | grep source
     # repo=centos-hyperscale-sig-packages-experimental-source-9-stream&arch=source
     # repo=centos-hyperscale-sig-packages-facebook-source-9-stream&arch=source
     # repo=centos-hyperscale-sig-packages-main-source-9-stream&arch=source
     # repo=centos-hyperscale-sig-packages-spin-source-9-stream&arch=source
    ```
    
    Signed-off-by: Michel Alexandre Salim <salimma@centosproject.org>