Add 'me-south-1' to valid S3 regions (#2192)

S3 region "me-south-1" is also available for nessie pipelines created via API
related: #2186

Author: santigracia

openapi/src/data-pipelines.openapi.yaml

@@ -598,6 +598,7 @@ components:
             - eu-west-2
             - eu-west-3
             - sa-east-1
+            - me-south-1
           description: The valid S3 region for the bucket.
         s3_role:
           type: string