Batch operations no longer work as of August 12, 2020

[bhahumanists]

As per the google notification, the batch endpoints are now disabled

Fix is to:

1. Update to the latest Google API PHP Client
2. Update the include paths at the top of googlegroup.php
3. In civicrm_api3_googlegroup_deletemember and civicrm_api3_googlegroup_subscribe, replace:

    $batch = new Google_Http_Batch($client);
    $service = new Google_Service_Directory($client);

with:

    $service = new Google_Service_Directory($client);
    $batch = new Google_Http_Batch($client, false, null, $service->batchPath);