Self Hosted base image updated to 26.0.8.23

[Manoj]

We are pleased to announce the upgrade of self-hosting base image to Nextcloud to ver 26.0.8.23

Release notes
Upgrade guide

Features:

• Base image updated to Nextcloud 26.0.8
• Gallery, calendar, contacts & webmail updated to recent versions
• Mailserver updated to 1.1.16
• automx replaced by wdes/mail-autodiscover-autoconfig

Thanks to the infra team and @smu44 for help with the testing.

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[smu44]

Thank you very much @manoj!