chore: update postcss

[PhilKsr]

DESCRIPTION

Update Postcss

TO-DO

• [x] implement and update tests
• [x] update docs
• [ ] pull main & resolve merge conflicts
• [ ] check Vercel deployment

CLOSES

closes https://github.com/Frachtwerk/essencium-frontend/security/dependabot/10

[vercel[bot]]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Updated (UTC)
app	✅ Ready (Inspect)	Visit Preview	Feb 28, 2024 3:01pm
docs	✅ Ready (Inspect)	Visit Preview	Feb 28, 2024 3:01pm

[nx-cloud[bot]]

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