Release 0.57.0

Improvements

• Make EKS 1.20 the default (#3943)
• Add stack status UpdateComplete as valid scenario (#3948)

Bug Fixes

• Fix panic for get nodegroup (#3960)
• Fix --wait issue for eksctl upgrade nodegroup command (#3956)
• Fix Config file schema docs page horizontal scroll (#3958)
• Validate cluster and nodegroup names to avoid cloudformation error (#3942)
• Use zone ID instead of zone name to avoid problematic zones (#3947)
• Remove --config-file flag from upgrade nodegroup (#3952)

Acknowledgments

Weaveworks would like to sincerely thank:
@vchetu