Run tfsec with reviewdog

Version updated for reviewdog/action-tfsec to version v1.20.1.

• This action is used across all versions by 327 repositories.

Go to the GitHub Marketplace to find the latest changes.

Release notes

What’s Changed

• Fix tfsec severity mapping (again) by @ysano in https://github.com/reviewdog/action-tfsec/pull/111

Full Changelog: https://github.com/reviewdog/action-tfsec/compare/v1.20.0...v1.20.1

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