Patch release, with a containerd security update.

Changelog

Updates

• kubernetes 1.21.3
• konnectivity 0.0.22
• runc 1.0.1
• containerd 1.4.8 (CVE-2021-32760)
• kine 0.6.3

Bug fixes

• Add ipv6 support to k0s-cloud-provider (#996)
• Delete kube-bridge on k0s reset (k0sproject/k0sctl#167)

Docs

• Add k0s-cloud-provider documentation updates (#1015)