chore(deps): update docker.io/xperimental/nextcloud-exporter docker tag to v0.8.0

This MR contains the following updates:

Package	Update	Change	OpenSSF
docker.io/xperimental/nextcloud-exporter	minor	0.7.0 -> 0.8.0

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Release Notes

xperimental/nextcloud-exporter (docker.io/xperimental/nextcloud-exporter)

v0.8.0

Compare Source

Added

• New metric showing available Nextcloud update (nextcloud_system_update_available)

Changed

• Updated Go runtime and dependencies

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