Bump cerdic/css-tidy from 1.7.2 to 1.7.3

Bumps [cerdic/css-tidy](https://github.com/Cerdic/CSSTidy) from 1.7.2 to 1.7.3.
- [Release notes](https://github.com/Cerdic/CSSTidy/releases)
- [Commits](https://github.com/Cerdic/CSSTidy/compare/v1.7.2...v1.7.3

)

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