chore(deps)(deps-dev): bump postcss from 8.5.6 to 8.5.9 in /desktop

[dependabot]

Bumps postcss from 8.5.6 to 8.5.9.

Release notes

Sourced from postcss's releases.

8.5.9

• Speed up source map encoding paring in case of the error.

8.5.8

• Fixed Processor#version.

8.5.7

• Improved source map annotation cleaning performance (by CodeAnt AI).

Changelog

Sourced from postcss's changelog.

8.5.9

• Speed up source map encoding paring in case of the error.

8.5.8

• Fixed Processor#version.

8.5.7

• Improved source map annotation cleaning performance (by CodeAnt AI).

Commits

• fe88ac2 Release 8.5.9 version
• c551632 Avoid RegExp when we can use simple JS
• 89a6b74 Move SECURITY.txt for docs folder to keep GitHub page cleaner
• 6ceb8a4 Create SECURITY.md
• 02ccae6 Another way to fix CI with .ts ext in tests on old Node.js
• 2c36658 Another way to fix CI with TS on old Node.js
• b906003 Another way to fix CI with old Node.js
• 04d32cd Fix another issue with Node.js 10 on CI
• df86cdf Try to fix Node.js 10 on CI
• 82bec0d Move to oxfmt
• Additional commits viewable in compare view

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[dependabot]

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Please fix the above issues or remove invalid values from dependabot.yml.

[AlexMikhalev]

Desktop dependencies belong in the separate desktop repository.

[dependabot]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.