Update requirements.txt

Author: fivetran-joemarkiewicz

integration_tests/requirements.txt

@@ -4,4 +4,4 @@ dbt-redshift>=1.3.0,<2.0.0
 dbt-postgres>=1.3.0,<2.0.0
 dbt-spark>=1.3.0,<2.0.0
 dbt-spark[PyHive]>=1.3.0,<2.0.0
-dbt-databricks>=1.3.0,<2.0.0
+dbt-databricks>=1.6.0,<2.0.0