fix(datapipelines): update the API

#### datapipelines:v1

The following keys were changed:
- schemas.GoogleProtobufEmpty.description

discovery/datapipelines-v1.json

@@ -371,7 +371,7 @@
       }
     }
   },
-  "revision": "20220116",
+  "revision": "20220319",
   "rootUrl": "https://datapipelines.googleapis.com/",
   "schemas": {
     "GoogleCloudDatapipelinesV1DataflowJobDetails": {
@@ -986,7 +986,7 @@
       "type": "object"
     },
     "GoogleProtobufEmpty": {
-      "description": "A generic empty message that you can re-use to avoid defining duplicated empty messages in your APIs. A typical example is to use it as the request or the response type of an API method. For instance: service Foo { rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty); } The JSON representation for `Empty` is empty JSON object `{}`.",
+      "description": "A generic empty message that you can re-use to avoid defining duplicated empty messages in your APIs. A typical example is to use it as the request or the response type of an API method. For instance: service Foo { rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty); }",
       "id": "GoogleProtobufEmpty",
       "properties": {},
       "type": "object"

src/apis/datapipelines/v1.ts

@@ -557,7 +557,7 @@ export namespace datapipelines_v1 {
     dataflowLaunchTemplateRequest?: Schema$GoogleCloudDatapipelinesV1LaunchTemplateRequest;
   }
   /**
-   * A generic empty message that you can re-use to avoid defining duplicated empty messages in your APIs. A typical example is to use it as the request or the response type of an API method. For instance: service Foo { rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty); \} The JSON representation for `Empty` is empty JSON object `{\}`.
+   * A generic empty message that you can re-use to avoid defining duplicated empty messages in your APIs. A typical example is to use it as the request or the response type of an API method. For instance: service Foo { rpc Bar(google.protobuf.Empty) returns (google.protobuf.Empty); \}
    */
   export interface Schema$GoogleProtobufEmpty {}
   /**