Upgrade Nextcloud to version 33

[stephdl]

Upgrade Nextcloud to version 33 in the ns8-nextcloud module.

Proposed solution

Update the container image reference and any related configuration to use Nextcloud 33. Validate compatibility with existing integrations (LDAP, SMTP, apps) and run the test suite before releasing.

Alternative solutions

Stay on the current version until a minor release of Nextcloud 33 is available (e.g., 33.0.1) for improved stability.

Additional context

• Nextcloud 33 release notes: https://nextcloud.com/changelog/

See also

• https://community.nethserver.org