feat(appengine): update the API

#### appengine:v1beta
The following keys were added:
- schemas.Version.properties.appEngineApis.description
- schemas.Version.properties.appEngineApis.type

discovery/appengine-v1beta.json

@@ -1594,7 +1594,7 @@
       }
     }
   },
-  "revision": "20201107",
+  "revision": "20201114",
   "rootUrl": "https://appengine.googleapis.com/",
   "schemas": {
     "ApiConfigHandler": {
@@ -3492,6 +3492,10 @@
           "$ref": "ApiConfigHandler",
           "description": "Serving configuration for Google Cloud Endpoints (https://cloud.google.com/appengine/docs/python/endpoints/).Only returned in GET requests if view=FULL is set."
         },
+        "appEngineApis": {
+          "description": "app_engine_apis allows Second Generation runtimes to access the App Engine APIs.",
+          "type": "boolean"
+        },
         "automaticScaling": {
           "$ref": "AutomaticScaling",
           "description": "Automatic scaling is based on request rate, response latencies, and other application metrics. Instances are dynamically created and destroyed as needed in order to handle traffic."

src/apis/appengine/v1beta.ts

@@ -1465,6 +1465,10 @@ export namespace appengine_v1beta {
      * Serving configuration for Google Cloud Endpoints (https://cloud.google.com/appengine/docs/python/endpoints/).Only returned in GET requests if view=FULL is set.
      */
     apiConfig?: Schema$ApiConfigHandler;
+    /**
+     * app_engine_apis allows Second Generation runtimes to access the App Engine APIs.
+     */
+    appEngineApis?: boolean | null;
     /**
      * Automatic scaling is based on request rate, response latencies, and other application metrics. Instances are dynamically created and destroyed as needed in order to handle traffic.
      */
@@ -6368,6 +6372,7 @@ export namespace appengine_v1beta {
      *       // request body parameters
      *       // {
      *       //   "apiConfig": {},
+     *       //   "appEngineApis": false,
      *       //   "automaticScaling": {},
      *       //   "basicScaling": {},
      *       //   "betaSettings": {},
@@ -6692,6 +6697,7 @@ export namespace appengine_v1beta {
      *   // Example response
      *   // {
      *   //   "apiConfig": {},
+     *   //   "appEngineApis": false,
      *   //   "automaticScaling": {},
      *   //   "basicScaling": {},
      *   //   "betaSettings": {},
@@ -7010,6 +7016,7 @@ export namespace appengine_v1beta {
      *       // request body parameters
      *       // {
      *       //   "apiConfig": {},
+     *       //   "appEngineApis": false,
      *       //   "automaticScaling": {},
      *       //   "basicScaling": {},
      *       //   "betaSettings": {},