Update dependency kubernetes-sigs/cluster-api to v1.10.6

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This PR contains the following updates:

Package	Update	Change
kubernetes-sigs/cluster-api	patch	v1.10.5 -> v1.10.6

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Release Notes

kubernetes-sigs/cluster-api (kubernetes-sigs/cluster-api)

v1.10.6

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Release note:

The following dependencies have been updated:
- `kubernetes-sigs/cluster-api` from `v1.10.5` to `v1.10.6`. [Release Notes](https://redirect.github.com/kubernetes-sigs/cluster-api/releases/tag/v1.10.6)

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