{RDBMS} az postgres flexible-server create: Sort the version number when displaying the error message

Author: Matthew Boentoro

src/azure-cli/azure/cli/command_modules/rdbms/validators.py

@@ -482,7 +482,7 @@ def _pg_storage_performance_tier_validator(performance_tier, sku_info, tier=None
 def _pg_version_validator(version, versions, is_create):
     if version:
         if version not in versions:
-            raise CLIError('Incorrect value for --version. Allowed values : {}'.format(versions))
+            raise CLIError('Incorrect value for --version. Allowed values : {}'.format(sorted(versions)))
         if version == '12':
             logger.warning("Support for PostgreSQL 12 has officially ended. As a result, "
                            "the option to select version 12 will be removed in the near future. "