fix(deps): update dependency postcss-rtlcss to v5.6.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss-rtlcss	5.1.2 -> 5.6.0

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Release Notes

elchininet/postcss-rtlcss (postcss-rtlcss)

v5.6.0

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• Add new directives to freeze rules and declarations /*rtl:freeze*/, /*rtl:begin:freeze*/ and /*rtl:end:freeze*/
• Remove references to the legacy package

v5.5.1

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• Small refactor to avoid a circular dependency between two parsers

v5.5.0

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• Support for nested at-rules

v5.4.0

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• Update RTLCSS to version 4.3.0

v5.3.1

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• Update RTLCSS to version 4.2.0

v5.3.0

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• Support specifying processors during processing CSS declarations
• Fix raw directive with universal selectors

v5.2.0

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• Add support for prefixes in ::view-transition rules

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