chore(deps): bump postcss, css-loader and @storybook/vue3

Bumps [postcss](https://github.com/postcss/postcss) to 8.5.1 and updates ancestor dependencies [postcss](https://github.com/postcss/postcss), [css-loader](https://github.com/webpack-contrib/css-loader) and [@storybook/vue3](https://github.com/storybookjs/storybook/tree/HEAD/code/renderers/vue3). These dependencies need to be updated together.


Updates `postcss` from 7.0.39 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@7.0.39...8.5.1)

Updates `css-loader` from 3.6.0 to 7.1.2
- [Release notes](https://github.com/webpack-contrib/css-loader/releases)
- [Changelog](https://github.com/webpack-contrib/css-loader/blob/master/CHANGELOG.md)
- [Commits](webpack-contrib/css-loader@v3.6.0...v7.1.2)

Updates `@storybook/vue3` from 6.5.16 to 8.5.3
- [Release notes](https://github.com/storybookjs/storybook/releases)
- [Changelog](https://github.com/storybookjs/storybook/blob/next/CHANGELOG.md)
- [Commits](https://github.com/storybookjs/storybook/commits/v8.5.3/code/renderers/vue3)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: indirect
- dependency-name: css-loader
  dependency-type: indirect
- dependency-name: "@storybook/vue3"
  dependency-type: direct:development
...

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