Referencing correct hooks for Apache Pinot

The `provider.yaml` for `airflow.providers.apache.pinot` provider was referencing a non-existing hook class of `PinotHook`, causing a warning during `providers_manager`'s sanity check. This corrects it to list both hooks of this provider.

Author: alexbegg

airflow/providers/apache/pinot/provider.yaml

@@ -59,5 +59,7 @@ hooks:
       - airflow.providers.apache.pinot.hooks.pinot
 
 connection-types:
-  - hook-class-name: airflow.providers.apache.pinot.hooks.pinot.PinotHook
+  - hook-class-name: airflow.providers.apache.pinot.hooks.pinot.PinotDbApiHook
     connection-type: pinot
+  - hook-class-name: airflow.providers.apache.pinot.hooks.pinot.PinotAdminHook
+    connection-type: pinot_admin