Add support to NC-Token

[shalak]

NextCloud 25 allows to use the /ocs/v2.php/apps/serverinfo/api/v1/info endpoint without user/password. As described at settings/admin/serverinfo page:

To use an access token, please generate one then set it using the following command: occ config:app:set serverinfo token --value yourtoken

Then pass the token with the "NC-Token" header when querying the above URL.