owncloud/core

Change: Update google/apiclient from 2.5.0 to 2.6.0 and related dependencies

This change updates the 3rd-party dependencies of files_external:
  - google/apiclient (v2.5.0 => v2.6.0)
  - google/auth (v1.9.0 => v1.10.0)
  - phpseclib/phpseclib (2.0.27 => 2.0.28)

https://github.com/owncloud/core/pull/37687