Quick CI update for redshift (#956)

increase dbt threads for redshift

Author: Sarah Morgan

ci_testing/profiles/redshift/profiles.yml

@@ -9,7 +9,7 @@ default:
       port: 5439
       ra3_node: true
       schema: default
-      threads: 2
+      threads: 4
       type: redshift
       user: "{{ env_var('DBT_REDSHIFT_CI_USER') }}"
   target: dev