Refine import of Dask Client

While the distributed module is technically the same as
dask.distributed, the latter is the canonical way of accessing it.

python_modules/libraries/dagster-dask/dagster_dask/resources.py

@@ -8,7 +8,7 @@
     String,
     resource,
 )
-from distributed import Client
+from dask.distributed import Client
 
 
 DaskClusterTypes = {