Support newer versions of databricks-sdk

[hauntsaninja]

Currently this pins databricks-sdk==0.17.0 for unclear reasons:

dbt-databricks/setup.py

Line 61 in ac4dee7

"databricks-sdk==0.17.0",

The pin was introduced in #572

[benc-db]

Working on this, though it has temporarily taken a back seat due to needing to respond to some platform breaking changes last week; the reason it was pinned is because 0.18.0 changes Azure OAuth behavior. The goal (which will release in 1.9) is to move to 0.29.0. It is not safe to unpin entirely because SDK is still in Beta and is still releasing breaking changes.