Update IAM policy for loadbalancer controller

[chjtwork]

Description

Update IAM policy statement for loadbalancer controller which upgraded in v2.7.0

https://github.com/kubernetes-sigs/aws-load-balancer-controller/releases/tag/v2.7.0
https://raw.githubusercontent.com/kubernetes-sigs/aws-load-balancer-controller/v2.8.1/docs/install/iam_policy.json

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the userdocs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes
• (Core team) Added labels for change area (e.g. area/nodegroup) and kind (e.g. kind/improvement)

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

[github-actions]

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