chore: bump postcss from 8.4.41 to 8.4.43 in /frontend/extension

[dependabot[bot]]

Bumps postcss from 8.4.41 to 8.4.43.

Release notes

Sourced from postcss's releases.

8.4.43

• Fixed markClean is not a function error.

8.4.42

• Fixed CSS syntax error on long minified files (by @​varpstar).

Changelog

Sourced from postcss's changelog.

8.4.43

• Fixed markClean is not a function error.

8.4.42

• Fixed CSS syntax error on long minified files (by @​varpstar).

Commits

• b985ed1 Release 8.4.43 version
• 3025b74 Update dependencies
• 79ff980 Update AST if it is not made by PostCSS >= 8.4.41
• 0fda48a Release 8.4.42 version
• cd5b08c Add ESLint to CI
• 0975cc2 Sort source code and fix ESLint
• 36950b4 Try to fix old Node.js tests
• fbb6d60 Update dependencies
• 118ebc9 Clean up code
• 9e7bdca Pretty CssSyntaxError from onelined (minified) css (#1965)
• Additional commits viewable in compare view

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