fix ci 2

Author: jinseopkim0

generation_config.yaml

@@ -2614,15 +2614,6 @@ libraries:
   - proto_path: google/shopping/merchant/reviews/v1beta
   requires_billing: true
   library_name: shopping-merchant-reviews
-- api_shortname: showcase
-  excluded_poms: gapic-showcase-bom
-  name_pretty: Showcase
-  api_description: Showcase module
-  product_documentation: https://cloud.google.com/dummy
-  distribution_name: com.google.cloud:gapic-showcase
-  library_type: OTHER
-  GAPICs:
-  - proto_path: schema/google/showcase/v1beta1
 - api_shortname: spanner
   name_pretty: Cloud Spanner
   product_documentation: https://cloud.google.com/spanner/docs/