composer-dev(deps-dev): bump tijsverkoyen/css-to-inline-styles (#40)

Bumps [tijsverkoyen/css-to-inline-styles](https://github.com/tijsverkoyen/CssToInlineStyles) from 2.3.0 to 2.4.0.
- [Release notes](https://github.com/tijsverkoyen/CssToInlineStyles/releases)
- [Changelog](https://github.com/tijsverkoyen/CssToInlineStyles/blob/master/CHANGELOG.md)
- [Commits](tijsverkoyen/CssToInlineStyles@v2.3.0...v2.4.0)

---
updated-dependencies:
- dependency-name: tijsverkoyen/css-to-inline-styles
  dependency-version: 2.4.0
  dependency-type: indirect
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]