Update dependency stylelint-config-prettier to v9

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
stylelint-config-prettier	8.0.2 -> 9.0.5

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Release Notes

prettier/stylelint-config-prettier (stylelint-config-prettier)

v9.0.5

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As of Stylelint v15, you may not need this package anymore. #​140

v9.0.4

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Bugfixes:

• Supported internal API refactor. (#​134, #​135, #​136)

v9.0.3

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• Re-adds a rule from v8 that had been removed, but is needed (#​129).

v9.0.2

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• Drops new SCSS rules as they cause errors unless using the SCSS plugin

v9.0.1

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Fixes commit history.

v9.0.0

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• Updates rules (#​125)
• Adds SCSS rule resets (#​124)
• Sorts rules
• Simplifies package.json
• Migrates from Travis CI to Github Workflows

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