v0.21.0rc2

major difference

experiment with reimplementing dbt-sqlserver's custom test materialization inside of dbt-synapse. ultimately wasn't needed...

What's Changed

• ensure pool pauses after run by @swanderz in #57
• v0.20.0 by @swanderz in #55

Full Changelog: v0.20.0...v0.21.0rc2