It seems no jars for tags after v7.5.3 are landing in https://packages.confluent.io/maven/io/confluent/common/
As reported on confluentinc/kafka-connect-storage-cloud#704 we are unable to build downstream projects (e.g. kafka-connect-storage-cloud) without first building all confluent library dependency projects locally.
Note that this problem extends to all Confluent libraries and isn't just related to common, however we thought this might be a good place to report it to get the issue noticed and addressed.
Please let us know if more information is required.
Thanks!