🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Author: gcf-owl-bot[bot]

README.md

@@ -147,11 +147,11 @@ function getAuthenticatedClient() {
   return new Promise((resolve, reject) => {
     // create an oAuth client to authorize the API call.  Secrets are kept in a `keys.json` file,
     // which should be downloaded from the Google Developers Console.
-    const oAuth2Client = new OAuth2Client(
-      keys.web.client_id,
-      keys.web.client_secret,
-      keys.web.redirect_uris[0]
-    );
+    const oAuth2Client = new OAuth2Client({
+      clientId: keys.web.client_id,
+      clientSecret: keys.web.client_secret,
+      redirectUri: keys.web.redirect_uris[0]
+    });
 
     // Generate the url that will be used for the consent dialog.
     const authorizeUrl = oAuth2Client.generateAuthUrl({
@@ -1304,7 +1304,7 @@ const googleAuth = new GoogleAuth({
 const client = await googleAuth.getClient();
 
 // Use the client to create a DownscopedClient.
-const cabClient = new DownscopedClient(client, cab);
+const cabClient = new DownscopedClient({authClient: client, credentialAccessBoundary: cab});
 
 // Refresh the tokens.
 const refreshedAccessToken = await cabClient.getAccessToken();