Update dependency stylelint-config-spaceninja to v15 [skip netlify]

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
stylelint-config-spaceninja	14.0.0 -> 15.0.0

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Release Notes

spaceninja/stylelint-config-spaceninja (stylelint-config-spaceninja)

v15.0.0

Compare Source

• Removed stylelint-a11y
  This plugin is no longer maintained, and I found I was disabling one
  of the three rules it added most of the time.
  @​see https://github.com/YozhikM/stylelint-a11y/issues/65
• Updated stylelint-config-standard-scss to v13
• Updated stylelint peer dependency to v16

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