Teradata dbt utils 1.3.0

[septimit]

Description

Update teradata-utils to dbt-utils 1.3.0 Fixes at_least_one macro Decommissions the old test suite.

Checklist

• [x] I have run this code in development and it appears to resolve the stated issue
• [ ] This PR includes tests, or tests are not required/relevant for this PR
• [x] I have updated the CHANGELOG.md with information about my change