Update Helm release nextcloud to v4.6.6

This MR contains the following updates:

Package	Update	Change
nextcloud (source)	patch	4.6.5 -> 4.6.6

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Release Notes

nextcloud/helm (nextcloud)

v4.6.6

Compare Source

A file sharing server that puts the control and security of your own data back into your hands.

What's Changed

• feat: keep PVCs when uninstalling helm chart by @​Leptopoda in https://github.com/nextcloud/helm/pull/555

New Contributors

• @​Leptopoda made their first contribution in https://github.com/nextcloud/helm/pull/555

Full Changelog: https://github.com/nextcloud/helm/compare/nextcloud-4.6.5...nextcloud-4.6.6

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