Upgrade: [dependabot] - bump cfn-lint from 1.20.2 to 1.21.0

Bumps [cfn-lint](https://github.com/aws-cloudformation/cfn-lint) from 1.20.2 to 1.21.0.
- [Release notes](https://github.com/aws-cloudformation/cfn-lint/releases)
- [Changelog](https://github.com/aws-cloudformation/cfn-lint/blob/main/CHANGELOG.md)
- [Commits](aws-cloudformation/cfn-lint@v1.20.2...v1.21.0)

---
updated-dependencies:
- dependency-name: cfn-lint
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

poetry.lock

@@ -28,7 +28,7 @@ requests = "^2.32.3"
 flake8 = "^7.1.1"
 pip-licenses = "^4.5.1"
 pre-commit = "^3.5.0"
-cfn-lint = "^1.20.2"
+cfn-lint = "^1.21.0"
 
 [tool.poetry.scripts]