Some tools in the documentations are either unmaintained or too old

Hello,

I have reading the documentations thoughtfully, and I spotted quite few tools that either unmaintained or too old.
For instance  [dockerfile_lint](https://github.com/aws/aws-eks-best-practices/blob/master/content/security/docs/image.md?plain=1#L166) was updated last time four years ago, it would make sense to mention for example [hadolint](https://github.com/hadolint/hadolint), etc.
