chore(openapi): update kafka-admin/v1 OpenAPI document (#208)

Co-authored-by: app-services-ci <app-services-ci@users.noreply.github.com>

Author: app-services-ci

.openapi/kafka-admin-rest.yaml

@@ -848,7 +848,7 @@ components:
         The literal prefix value of `User:` is required. May be used to specify
         all users with value `User:*`.
       type: string
-      pattern: '^User:(\*|[a-zA-Z0-9_-]+)$'
+      pattern: '^User:(\*|[a-zA-Z0-9_@.-]+)$'
       example: 'User:user-123-abc'
     Topic:
       title: Root Type for NewTopicInput