[...]

Please check if the URIs defined for this repository are pointing to a valid repository.
Skipping repository 'trinity' because of the above error.
Retrieving repository 'trinity-noarch' metadata .....................................................................................................................................................................................[error]
Repository 'trinity-noarch' is invalid.
[trinity-noarch|http://mirror.ppa.trinitydesktop.org/trinity/rpm/opensuse15.3/trinity-r14/RPMS/noarch] Valid metadata not found at specified URL
History:
 - File './repodata/df43098b8eb4b9b9c38b0bdd574746245eefd9ee3a6677672736a3db059791b9-primary.xml.gz' not found on medium 'http://mirror.ppa.trinitydesktop.org/trinity/rpm/opensuse15.3/trinity-r14/RPMS/noarch'
 - Can't provide ./repodata/df43098b8eb4b9b9c38b0bdd574746245eefd9ee3a6677672736a3db059791b9-primary.xml.gz

Hello,

I've updated the repository metadata, you can wait for the mirror to synchronize and try again.

François