Bump postcss from 8.4.38 to 8.4.40 in /ui.frontend

[dependabot[bot]]

Bumps postcss from 8.4.38 to 8.4.40.

Release notes

Sourced from postcss's releases.

8.4.40

• Moved to getter/setter in nodes types to help Sass team (by @​nex3).

8.4.39

• Fixed CssSyntaxError types (by @​romainmenke).

Changelog

Sourced from postcss's changelog.

8.4.40

• Moved to getter/setter in nodes types to help Sass team (by @​nex3).

8.4.39

• Fixed CssSyntaxError types (by @​romainmenke).

Commits

• 3f84b41 Release 8.4.40 version
• 293ce45 Merge pull request #1950 from nex3/node-getters
• fd7ae73 Declare Node subclass attributes as getters
• 79a6396 Update dependencies
• 53968d7 Make name more clear
• e0efb16 Release 8.4.39 version
• 48304c5 Update dependencies
• 155ac57 Merge pull request #1947 from romainmenke/fix-css-syntax-error-type--reliable...
• 1b9b466 fix CssSyntaxError type declaration
• 3f4d96e Update dependencies
• Additional commits viewable in compare view

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