fix(servicemanagement): update the API

#### servicemanagement:v1

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

discovery/servicemanagement-v1.json

@@ -3,7 +3,7 @@
     "oauth2": {
       "scopes": {
         "https://www.googleapis.com/auth/cloud-platform": {
-          "description": "View and manage your data across Google Cloud Platform services"
+          "description": "See, edit, configure, and delete your Google Cloud Platform data"
         },
         "https://www.googleapis.com/auth/cloud-platform.read-only": {
           "description": "View your data across Google Cloud Platform services"
@@ -829,7 +829,7 @@
       }
     }
   },
-  "revision": "20210319",
+  "revision": "20210331",
   "rootUrl": "https://servicemanagement.googleapis.com/",
   "schemas": {
     "Advice": {
@@ -2708,7 +2708,7 @@
           "description": "Billing configuration."
         },
         "configVersion": {
-          "description": "Deprecated. The service config compiler always sets this field to `3`.",
+          "description": "Obsolete. Do not use. This field has no semantic meaning. The service config compiler always sets this field to `3`.",
           "format": "uint32",
           "type": "integer"
         },

src/apis/servicemanagement/v1.ts

@@ -1392,7 +1392,7 @@ export namespace servicemanagement_v1 {
      */
     billing?: Schema$Billing;
     /**
-     * Deprecated. The service config compiler always sets this field to `3`.
+     * Obsolete. Do not use. This field has no semantic meaning. The service config compiler always sets this field to `3`.
      */
     configVersion?: number | null;
     /**