Build(deps-dev): Bump the dev dependencies with 2 updates (#42395)

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


Updates `postcss` from 8.5.10 to 8.5.12
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/compare/8.5.10...8.5.12)

Updates `terser` from 5.46.1 to 5.46.2
- [Changelog](https://github.com/terser/terser/blob/master/CHANGELOG.md)
- [Commits](https://github.com/terser/terser/compare/v5.46.1...v5.46.2)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.12
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: development-dependencies
- dependency-name: terser
  dependency-version: 5.46.2
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: development-dependencies
...

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