Bump postcss in the postcss group across 1 directory

Bumps the postcss group with 1 update in the / directory: [postcss](https://github.com/postcss/postcss).


Updates `postcss` from 8.4.47 to 8.4.49
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.47...8.4.49)

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

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