feat(tagmanager): update the API

#### tagmanager:v2
The following keys were added:
- schemas.ContainerVersionHeader.properties.numClients.description
- schemas.ContainerVersionHeader.properties.numClients.type
- schemas.Entity.properties.client.$ref
- schemas.Entity.properties.client.description

The following keys were changed:
- schemas.Entity.properties.folder.description

discovery/tagmanager-v2.json

@@ -3125,7 +3125,7 @@
       }
     }
   },
-  "revision": "20200930",
+  "revision": "20201024",
   "rootUrl": "https://tagmanager.googleapis.com/",
   "schemas": {
     "Account": {
@@ -3795,6 +3795,10 @@
           "description": "Container version display name.",
           "type": "string"
         },
+        "numClients": {
+          "description": "Number of clients in the container version.",
+          "type": "string"
+        },
         "numCustomTemplates": {
           "description": "Number of custom templates in the container version.",
           "type": "string"
@@ -3950,9 +3954,13 @@
           ],
           "type": "string"
         },
+        "client": {
+          "$ref": "Client",
+          "description": "The client being represented by the entity."
+        },
         "folder": {
           "$ref": "Folder",
-          "description": "The Folder being represented by the entity."
+          "description": "The folder being represented by the entity."
         },
         "tag": {
           "$ref": "Tag",

src/apis/tagmanager/v2.ts

@@ -416,6 +416,10 @@ export namespace tagmanager_v2 {
      * Container version display name.
      */
     name?: string | null;
+    /**
+     * Number of clients in the container version.
+     */
+    numClients?: string | null;
     /**
      * Number of custom templates in the container version.
      */
@@ -543,7 +547,11 @@ export namespace tagmanager_v2 {
      */
     changeStatus?: string | null;
     /**
-     * The Folder being represented by the entity.
+     * The client being represented by the entity.
+     */
+    client?: Schema$Client;
+    /**
+     * The folder being represented by the entity.
      */
     folder?: Schema$Folder;
     /**
@@ -5016,6 +5024,7 @@ export namespace tagmanager_v2 {
      *   //   "containerVersionId": "my_containerVersionId",
      *   //   "deleted": false,
      *   //   "name": "my_name",
+     *   //   "numClients": "my_numClients",
      *   //   "numCustomTemplates": "my_numCustomTemplates",
      *   //   "numMacros": "my_numMacros",
      *   //   "numRules": "my_numRules",
@@ -6371,6 +6380,7 @@ export namespace tagmanager_v2 {
      *       // request body parameters
      *       // {
      *       //   "changeStatus": "my_changeStatus",
+     *       //   "client": {},
      *       //   "folder": {},
      *       //   "tag": {},
      *       //   "trigger": {},