[Snyk] Upgrade postcss from 8.4.18 to 8.4.21

[snyk-bot]

Snyk has created this PR to upgrade postcss from 8.4.18 to 8.4.21.

ℹ️ Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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• The recommended version is 3 versions ahead of your current version.
• The recommended version was released 3 months ago, on 2023-01-06.

Release notes

Package name: postcss

• 8.4.21 - 2023-01-06
  
  • Fixed Input#error types (by @ hudochenkov).
• 8.4.20 - 2022-12-11
  
  • Fixed source map generation for childless at-rules like @ layer.
• 8.4.19 - 2022-11-10
  
  • Fixed whitespace preserving after AST transformations (by @ romainmenke).
• 8.4.18 - 2022-10-12
  
  • Fixed an error on absolute: true with empty sourceContent (by @ KingSora).

from postcss GitHub release notes

Commit messages

Package name: postcss

• 32ced0e Release 8.4.21 version
• a936b80 Update dependencies
• c9bd445 Fix types
• 4ad96d1 Merge pull request #1811 from hudochenkov/fix-input-types
• 15f5fad Add types for an Input.error()
• 43bd2df Merge pull request #1808 from hudochenkov/update-syntaxes
• 292b8f0 Add postcss-styled-syntax to list of syntaxes
• 29f5168 Update postcss-html and postcss-markdown repositories
• 1d4c509 Release 8.4.20 version
• 905082a Add Node.js 10 to CI
• 20122e5 Fix childless at-rule map generation
• ff7e8ce Merge pull request #1801 from romainmenke/invalid-sourcemap-with-at-layer--practical-grey-mouse-lemur-3c469975f4
• d585976 Fix CI
• 744b15f Update dependencies
• db935f1 invalid sourcemap with at layer
• 3cac84a Fix type tests
• 5113edb Update dependencies
• c26baf3 Release 8.4.19 version
• ed5103d Update dependencies
• 8086ea3 Merge pull request #1790 from romainmenke/fix-whitespace-bug--passionate-african-bush-elephant-9ae98c1a5a
• 4b38845 fix whitespace bug
• cf9425a Merge pull request #1789 from eduardopilati/patch-1
• ca04e0a Update plugins.md
• fe63768 Update dependencies

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