fix: Correct default values which should be an array of strings

[bryantbiggs]

• values should be an array of strings

Associated issue aws-ia/terraform-aws-eks-blueprints#1060

[bryantbiggs]

@ksatirli please feel free to merge when ready - not sure what the docs check is complaining about

[ksatirli]

@bryantbiggs I looked into the docs check and couldn't figure it out just yet, so we'll ignore that for now.

[bryantbiggs]

thanks @ksatirli - do you think you'll be able to cut a new release for this fix?

[ksatirli]

@bryantbiggs all done! New release candidate is live.

If we don't get any breaking changes, this will become 1.0.0 soon, thanks to your awesome contributions!