Remove repositories from build.gradle that are not needed

In order to do a local Jenkins build, we have to make sure that just the absolute minimum number of repositories be defined in build.gradle.   For presto connector, this is:

trino/build.gradle:        url = uri('https://packages.confluent.io/maven/')
trino/build.gradle:        url = uri('https://oss.sonatype.org/content/repositories/snapshots')