npm(deps): bump the npm group with 1 update

[dependabot[bot]]

Bumps the npm group with 1 update: postcss.

Release notes

Sourced from postcss's releases.

8.4.28

• Fixed Root.source.end for better source map (by @​romainmenke).
• Fixed Result.root types when process() has no parser.

Changelog

Sourced from postcss's changelog.

8.4.28

• Fixed Root.source.end for better source map (by Romain Menke).
• Fixed Result.root types when process() has no parser.

Commits

• b0efcc0 Release 8.4.28 version
• 33aca81 Fix tests
• b352861 Merge pull request #1872 from romainmenke/add-source.end-to-root-nodes--compa...
• 1bcc280 add source.end to Root nodes
• ec034e4 Merge pull request #1871 from RiadhAdrani/main
• 6222d3d chore: add postcss-plugin-ignore-file to plugins.md
• 7d51976 Cast Result.root type from process() options
• 0ef29c2 Update dependecnies
• a0a82d3 Merge pull request #1867 from strarsis/add-postcss-baseurl-plugin
• 510d0a5 Add postcss-urlrebase plugin to plugins page.
• Additional commits viewable in compare view

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