Update docker.io/nextcloud Docker tag to v30

Semiautomated major upgrade by means of Watchtower Docker container management with dependency update facilitated by Mend's Renovate Bot.

This MR contains the following updates:

Package Update Change
docker.io/nextcloud major 29.0.8-apache -> 30.0.2-apache

Release Notes

nextcloud/server (docker.io/nextcloud)

v30.0.2

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What's Changed

Full Changelog: https://github.com/nextcloud/server/compare/v30.0.1...v30.0.2

v30.0.1

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What's Changed

Full Changelog: https://github.com/nextcloud/server/compare/v30.0.0...v30.0.1

v30.0.0

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What's Changed

Changelog since v30.0.0rc5: https://github.com/nextcloud/server/compare/v30.0.0rc5...v30.0.0

Full Changelog for v30.0.0: https://nextcloud.com/changelog/[#​30](https://github.com/nextcloud/server/issues/30)-0-0

v29.0.9

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What's Changed

Full Changelog: https://github.com/nextcloud/server/compare/v29.0.8...v29.0.9