build(deps-dev): bump the development group with 2 updates

Bumps the development group with 2 updates: [@testing-library/jest-dom](https://github.com/testing-library/jest-dom) and [postcss-loader](https://github.com/webpack-contrib/postcss-loader).


Updates `@testing-library/jest-dom` from 6.1.5 to 6.1.6
- [Release notes](https://github.com/testing-library/jest-dom/releases)
- [Changelog](https://github.com/testing-library/jest-dom/blob/main/CHANGELOG.md)
- [Commits](https://github.com/testing-library/jest-dom/compare/v6.1.5...v6.1.6)

Updates `postcss-loader` from 7.3.3 to 7.3.4
- [Release notes](https://github.com/webpack-contrib/postcss-loader/releases)
- [Changelog](https://github.com/webpack-contrib/postcss-loader/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/postcss-loader/compare/v7.3.3...v7.3.4)

---
updated-dependencies:
- dependency-name: "@testing-library/jest-dom"
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: development
- dependency-name: postcss-loader
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: development
...

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

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