Bump tinycss2 from 1.3.0 to 1.4.0

Bumps [tinycss2](https://github.com/Kozea/tinycss2) from 1.3.0 to 1.4.0.
- [Release notes](https://github.com/Kozea/tinycss2/releases)
- [Changelog](https://github.com/Kozea/tinycss2/blob/main/docs/changelog.rst)
- [Commits](Kozea/tinycss2@v1.3.0...v1.4.0)

---
updated-dependencies:
- dependency-name: tinycss2
  dependency-type: indirect
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]