Update Go SDK to v0.19.1 (#759)

This includes token reuse for Azure CLI based auth.

See:
https://github.com/databricks/databricks-sdk-go/releases/tag/v0.19.1

Confirmed manually that Azure CLI tokens are acquired only once.

go.mod

@@ -6,7 +6,7 @@ replace github.com/databricks/databricks-sdk-go => github.com/databricks/databri
 
 require (
 	github.com/briandowns/spinner v1.23.0 // Apache 2.0
-	github.com/databricks/databricks-sdk-go v0.19.0 // Apache 2.0
+	github.com/databricks/databricks-sdk-go v0.19.1 // Apache 2.0
 	github.com/fatih/color v1.15.0 // MIT
 	github.com/ghodss/yaml v1.0.0 // MIT + NOTICE
 	github.com/google/uuid v1.3.0 // BSD-3-Clause