Add to your nextcloud endpoint is not properly protected

This is related to https://hackerone.com/reports/1173684 The endpoint you hit does have bruteforce protection https://github.com/nextcloud/server/blob/master/apps/federatedfilesharing/lib/Controller/MountPublicLinkController.php#L126 But this is only triggered by finding a share that is password protected https://github.com/nextcloud/server/blob/master/apps/federatedfilesharing/lib/Controller/MountPublicLinkController.php#L157 Or a file drop public share https://github.com/nextcloud/server/blob/master/apps/federatedfilesharing/lib/Controller/MountPublicLinkController.php#L166 In other words this endpoint can also be used to try to brute force share tokens. ## Impact Low just like on the other report. But should be fixed non the less.