Approves requests to join a group.
Note: This function is only relevant for private groups.
The approveJoinRequests() function returns a Promise that resolves when a site member's request to join a group is approved.
Only site admins and group admins can approve site member requests to join a group, unless the group setting, membersCanApprove is set to true.
Note: If the suppressAuth option is set to true, all permissions are overwritten, and all site members (including non-group members) can approve site member requests to join a group.
Group ID and member IDs.
Authorization options.