Update dependency sass-true to v8

[renovate-rancher]

This PR contains the following updates:

Package	Type	Update	Change
sass-true (source)	devDependencies	major	^7.0.1 -> ^8.0.0

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Release Notes

oddbird/true (sass-true)

v8.1.0

Compare Source

• FEATURE: If True sass option is not specified, True will automatically
  attempt to use embedded-sass, then sass.
  #​290
• INTERNAL: Add sass and sass-embedded as optional peer-dependencies.
• INTERNAL: Update dependencies

v8.0.0

Compare Source

• FEATURE: Add True sass option (string or Sass implementation instance,
  defaults to 'sass') to allow using either sass or embedded-sass.
• FEATURE: Add the
  Node.js package importer
  to the Sass importers option by default, if Dart Sass v1.71 or later is
  available. Users can opt out by providing their own importers option, e.g.
  { importers: [] }.
• BREAKING: Drop support for node < 18
• INTERNAL: Remove sass as a peer-dependency.
• INTERNAL: Update dependencies

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