ci(deps): Update TFLint plugin terraform-linters/tflint-ruleset-aws to v0.21.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
terraform-linters/tflint-ruleset-aws	plugin	minor	0.20.0 -> 0.21.0

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Release Notes

terraform-linters/tflint-ruleset-aws

### [`v0.21.0`](https://togithub.com/terraform-linters/tflint-ruleset-aws/blob/HEAD/CHANGELOG.md#​0210-2022-12-05) [Compare Source](https://togithub.com/terraform-linters/tflint-ruleset-aws/compare/v0.20.0...v0.21.0) ##### Enhancements - [#​403](https://togithub.com/terraform-linters/tflint-ruleset-aws/pull/403): autogenerated maintenance - [#​405](https://togithub.com/terraform-linters/tflint-ruleset-aws/pull/405) [#​406](https://togithub.com/terraform-linters/tflint-ruleset-aws/pull/406): Add assume role configuration to plugin config ([@​kaito3desuyo](https://togithub.com/kaito3desuyo))

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Configuration

📅 Schedule: Branch creation - "after 10:30 before 18:00 every weekday except after 13:00 before 14:00" in timezone America/Lima, Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• [ ] If you want to rebase/retry this PR, check this box

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