Bump postcss from 8.5.6 to 8.5.10 in /extension

[dependabot]

Bumps postcss from 8.5.6 to 8.5.10.

Release notes

Sourced from postcss's releases.

8.5.10

• Fixed XSS via unescaped </style> in non-bundler cases (by @​TharVid).

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.

8.5.10

• Fixed XSS via unescaped </style> in non-bundler cases (by @​TharVid).

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

• 33b9790 Release 8.5.10 version
• 536c79e Escape </style> in CSS output (#2074)
• afa96b2 Update dependencies (#2073)
• effe88b Typo (#2072)
• 3ee79a2 Thread model (#2071)
• 2e0683d Create incident response docs (#2070)
• 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
• Additional commits viewable in compare view

Note
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[piyalbasu]

Superseded by #2821 — consolidated into one PR with build + tests passing.

[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.