Update module github.com/giantswarm/apiextensions/v6 to v6.6.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
github.com/giantswarm/apiextensions/v6	require	minor	v6.0.0 -> v6.6.0

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Release Notes

giantswarm/apiextensions (github.com/giantswarm/apiextensions/v6)

v6.6.0

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Added

• Annotation for EBS Volumes for Logging, Docker and Containerd.

v6.5.0

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Changed

• Bump release-operator to v4.0.0.

v6.4.1

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Changed

• Bump apiextensions-application to v0.6.0

Removed

• Removed etcdbackup CRD (moved to etcd-backup-operator's helm chart).

v6.4.0

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Added

• Add cilium.giantswarm.io/pod-cidr annotation.

v6.3.1

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• Bump apiextensions-application to v0.5.1

v6.3.0

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• Bump apiextensions-application to v0.5.0

v6.2.0

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v6.1.0

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Added

• Add ClustersRegex property to etcd backup type in order to allow select which clusters etcd backup will run.

Changed

• Replace all github.com/gogo/protobuf versions with v1.3.2
• Update Silence CRD with changes from silence-operator v0.6.1

Removed

• Remove Organization API.

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