Bump the npm-dependencies group with 4 updates

Bumps the npm-dependencies group with 4 updates: [cssnano](https://github.com/cssnano/cssnano), [postcss-import](https://github.com/postcss/postcss-import), [rollup](https://github.com/rollup/rollup) and [stylelint](https://github.com/stylelint/stylelint).


Updates `cssnano` from 6.0.2 to 6.0.3
- [Release notes](https://github.com/cssnano/cssnano/releases)
- [Commits](https://github.com/cssnano/cssnano/compare/[email protected]@6.0.3)

Updates `postcss-import` from 15.1.0 to 16.0.0
- [Release notes](https://github.com/postcss/postcss-import/releases)
- [Changelog](https://github.com/postcss/postcss-import/blob/master/CHANGELOG.md)
- [Commits](postcss/postcss-import@15.1.0...16.0.0)

Updates `rollup` from 4.9.1 to 4.9.4
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](rollup/rollup@v4.9.1...v4.9.4)

Updates `stylelint` from 16.0.2 to 16.1.0
- [Release notes](https://github.com/stylelint/stylelint/releases)
- [Changelog](https://github.com/stylelint/stylelint/blob/main/CHANGELOG.md)
- [Commits](stylelint/stylelint@16.0.2...16.1.0)

---
updated-dependencies:
- dependency-name: cssnano
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: npm-dependencies
- dependency-name: postcss-import
  dependency-type: direct:development
  update-type: version-update:semver-major
  dependency-group: npm-dependencies
- dependency-name: rollup
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: npm-dependencies
- dependency-name: stylelint
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: npm-dependencies
...

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