build: [merchantapi] update package name for datasources and promotio…

…ns nodejs_gapic_library targets (#5444)

* build: update package name for datasources and promotions nodejs_gapic_library targets

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Source-Link: googleapis/googleapis@b9b8f63

Source-Link: googleapis/googleapis-gen@0e06436
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packages/google-shopping-merchant-datasources/samples/generated/v1beta/data_sources_service.create_data_source.js

@@ -39,7 +39,7 @@ function main(parent, dataSource) {
   // const dataSource = {}
 
   // Imports the Datasources library
-  const {DataSourcesServiceClient} = require('@google-shopping/datasourcescescesces').v1beta;
+  const {DataSourcesServiceClient} = require('@google-shopping/datasources').v1beta;
 
   // Instantiates a client
   const datasourcesClient = new DataSourcesServiceClient();