automation: Add upgrade check for versions of `tflint-ruleset-aws`

[gdavison]

The tflint tool has moved provider-specific rulesets to plugins, such as tflint-ruleset-aws. While the tflint core can be upgraded using Dependabot, there is no equivalent tracking for the plugins.

Add a GitHub Action to check for a new version and create a new PR

Relates #23303

[PatMyron]

related: terraform-linters/tflint#1181
could do similar to aws-cloudformation/cfn-lint#2246

[github-actions]

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[github-actions]

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