Update dependency ONLYOFFICE/onlyoffice-nextcloud to v7.8.0

This MR contains the following updates:

Package	Update	Change
ONLYOFFICE/onlyoffice-nextcloud	minor	v7.6.8 -> v7.8.0

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Release Notes

ONLYOFFICE/onlyoffice-nextcloud

v7.8.0

Compare Source

Added

• disable plugins setting
• document protection setting
• jwt leeway setting
• Danish translation

Changed

• fix thumbnails for version files
• fix notification length
• compatible with Nextcloud 26
• additional check availability for group and external files when mention

v7.7.0

Compare Source

Added

• disable plugins setting
• document protection setting
• jwt leeway setting
• Danish translation

Changed

• fix thumbnails for version files
• fix notification length
• additional check availability for group and external files when mention

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