Fix .asf.yaml (#146)

Author: potiuk

.asf.yaml

@@ -41,5 +41,5 @@ github:
         required_approving_review_count: 1
 notifications:
   commits:      commits@airflow.apache.org
-  issues:       commits@airflow.apache.org
+  discussions:  commits@airflow.apache.org
   pullrequests: commits@airflow.apache.org