chore: Update blunderbuss.yml (#12981)

This commit corrects the team who maintains Cloud SQL samples.

Author: enocom

.github/blunderbuss.yml

@@ -40,7 +40,7 @@ assign_issues_by:
   - labels:
       - "api: cloudsql"
     to:
-      - GoogleCloudPlatform/infra-db-sdk
+      - GoogleCloudPlatform/cloud-sql-connectors
   - labels:
       - "api: bigtable"
       - "api: datastore"