fix(recommendationengine): update the API

#### recommendationengine:v1beta1

The following keys were changed:
- auth.oauth2.scopes.https://www.googleapis.com/auth/cloud-platform.description
- schemas.GoogleCloudRecommendationengineV1beta1PredictRequest.properties.dryRun.description

discovery/recommendationengine-v1beta1.json

@@ -3,7 +3,7 @@
     "oauth2": {
       "scopes": {
         "https://www.googleapis.com/auth/cloud-platform": {
-          "description": "See, edit, configure, and delete your Google Cloud Platform data"
+          "description": "See, edit, configure, and delete your Google Cloud data and see the email address for your Google Account."
         }
       }
     }
@@ -842,7 +842,7 @@
       }
     }
   },
-  "revision": "20210702",
+  "revision": "20210909",
   "rootUrl": "https://recommendationengine.googleapis.com/",
   "schemas": {
     "GoogleApiHttpBody": {
@@ -1433,7 +1433,7 @@
       "id": "GoogleCloudRecommendationengineV1beta1PredictRequest",
       "properties": {
         "dryRun": {
-          "description": "Optional. Use dryRun mode for this prediction query. If set to true, a dummy model will be used that returns arbitrary catalog items. Note that the dryRun mode should only be used for testing the API, or if the model is not ready.",
+          "description": "Optional. Use dryRun mode for this prediction query. If set to true, a fake model will be used that returns arbitrary catalog items. Note that the dryRun mode should only be used for testing the API, or if the model is not ready.",
           "type": "boolean"
         },
         "filter": {

src/apis/recommendationengine/v1beta1.ts

@@ -586,7 +586,7 @@ export namespace recommendationengine_v1beta1 {
    */
   export interface Schema$GoogleCloudRecommendationengineV1beta1PredictRequest {
     /**
-     * Optional. Use dryRun mode for this prediction query. If set to true, a dummy model will be used that returns arbitrary catalog items. Note that the dryRun mode should only be used for testing the API, or if the model is not ready.
+     * Optional. Use dryRun mode for this prediction query. If set to true, a fake model will be used that returns arbitrary catalog items. Note that the dryRun mode should only be used for testing the API, or if the model is not ready.
      */
     dryRun?: boolean | null;
     /**