Bump the js-dependencies group with 2 updates (#260)

Bumps the js-dependencies group with 2 updates: [postcss](https://github.com/postcss/postcss) and [sass](https://github.com/sass/dart-sass).


Updates `postcss` from 8.4.49 to 8.5.1
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.49...8.5.1)

Updates `sass` from 1.83.1 to 1.83.4
- [Release notes](https://github.com/sass/dart-sass/releases)
- [Changelog](https://github.com/sass/dart-sass/blob/main/CHANGELOG.md)
- [Commits](sass/dart-sass@1.83.1...1.83.4)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: js-dependencies
- dependency-name: sass
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: js-dependencies
...

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Author: dependabot[bot]