build(deps-dev): bump postcss-modules from 4.2.2 to 4.3.1

Bumps [postcss-modules](https://github.com/css-modules/postcss-modules) from 4.2.2 to 4.3.1.
- [Changelog](https://github.com/madyankin/postcss-modules/blob/master/CHANGELOG.md)
- [Commits](madyankin/postcss-modules@v4.2.2...v4.3.1)

---
updated-dependencies:
- dependency-name: postcss-modules
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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