Update dependency yamllint to v1.26.3

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
yamllint	==1.26.2 -> ==1.26.3

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Release Notes

adrienverge/yamllint

### [`v1.26.3`](https://togithub.com/adrienverge/yamllint/blob/master/CHANGELOG.rst#​1263-2021-08-21) [Compare Source](https://togithub.com/adrienverge/yamllint/compare/v1.26.2...v1.26.3) - Restore runtime dependency `setuptools` for Python < 3.8

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