chore(deps-dev): bump postcss from 8.2.13 to 8.2.15

[dependabot[bot]]

Bumps postcss from 8.2.13 to 8.2.15.

Release notes

Sourced from postcss's releases.

8.2.15

• Fixed list type definitions (by @​n19htz).

8.2.14

• Removed source-map from client-side bundle (by @​barak007).

Changelog

Sourced from postcss's changelog.

8.2.15

• Fixed list type definitions (by @​n19htz).

8.2.14

• Removed source-map from client-side bundle (by Barak Igal).

Commits

• 5061f7b Release 8.2.15 version
• da88b2e Update fs-extra
• 7a3d728 Try to fix CI
• f00a448 Update dependncies
• 29a260e Merge pull request #1577 from n19htz/fix-list-declaration
• 8a0e1eb fix List declartation
• ff8e52d Release 8.2.14 version
• 12359ea Update dependencies
• b158dd5 Merge pull request #1571 from barak007/source-map-browser
• de6f33c remove source-map from browser build
• Additional commits viewable in compare view

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[dependabot[bot]]

Looks like postcss is up-to-date now, so this is no longer needed.