It adds 1 new rule, adds 1 option to a rule and fixes 2 bugs.

• Added: rule-nesting-at-rule-required-list rule (#8680) (@sw1tch3roo).
• Added: ignoreAtRules: [] to nesting-selector-no-missing-scoping-root (#8743) (@karlhorky).
• Fixed: function-no-unknown false positives for contrast-color() and sibling-*() (#8729) (@Mouvedia).
• Fixed: selector-pseudo-class-no-unknown false positives for :heading (#8749) (@Mouvedia).