stale Update dependency cssstyle to v5 (main)

[elastic-renovate-prod]

This PR contains the following updates:

Package	Type	Update	Change
cssstyle	devDependencies	major	^4.1.0 -> ^5.2.1

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Release Notes

jsdom/cssstyle (cssstyle)

v5.2.1

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• Fix a regression in v5.2.0 where the generated files used \ in require() calls, which was very broken.

v5.2.0

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• Change the parser used for the cssText setter from rrweb-cssom to css-tree.

v5.1.0

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• Implement full display property parsing and serialization

v5.0.0

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The minimum supported Node.js version is now v20.

• Fix !important with custom properties. (This regressed in v4.4.0.)
• Lots of improvements to background-related property parsing and serialization.

v4.6.0

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• Add some missing system colors.
• Add generic() font-family keyword support.
• Fix system color serialization to be in lowercase.
• Fix negative margin parsing.
• Fix various case-insensitive testing and lowercasing to use ASCII, instead of Unicode.

v4.5.0

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• Update font-family parsing and serialization, and font shorthand parsing, to be spec-compliant.
• Fix some regressions in v4.4.0 related to using var() inside background-* properties.

v4.4.0

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• The cssText getter now returns the empty string if the computed flag is set.
• The cssText setter, and the removeProperty() and setProperty() methods, now throw if the readonly flag is set.
• The parentRule getter now returns the parent CSSRule instead of always returning null.
• The item() method now throws if no argument is given.
• Add camel-cased and Pascal-cased versions of WebKit properties, and fixed the raw properties to have a leading hyphen.
• Make internal properties non-enumerable to hide them better.
• Individual CSS property setters now handle invalid inputs better.
• Implement unset support.
• Update the property list to be based on the latest specs, in particular removing the deprecated azumith property and some deprecated WebKit properties.

v4.3.1

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• Improve url() parsing and serialization (#​194)
• Update @asamuzakjp/css-color to improve calc() serialization (#​192)

v4.3.0

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• Improve background-image parsing (#​186)
• Improve border-color parsing (#​185)
• Improve top/left/bottom/right to support the auto keyword (#​178)
• Update @asamuzakjp/css-color to improve color parsing (#​188)

v4.2.1

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Update rrweb-cssom dependency.

v4.2.0

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• Improve color support with the @asamuzakjp/css-color package (#​171)
• Support nested var() and nested calc() (#​179)

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[elasticmachine]

Pinging @elastic/kibana-operations (Team:Operations)

[azasypkin]

Approving to unblock. Deferring review to owning team @elastic/kibana-operations (do we still use this dependency, btw?)

[jbudz]

@eokoneyo it looks like this was introduced in #200703 but I'm also not seeing it imported anywhere. Any idea if this is still needed?

[elastic-renovate-prod]

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