fix(item): fix hover state for link items

[alexanderalgemi]

This fixes #8382

This PR fixes a bug in items that should function as a link. The on hover state was not working properly:

<Item variant="outline" role="listitem" asChild>
  <Link href={href}>
    <ItemContent>
      {/* ... */}
    </ItemContent>
  </Link>
</Item>

Shadcn uses the [a]:hover:bg-accent/50 class to target the anchor tag. This doesn't work, but [&:is(a):hover]:bg-accent/50 does.

Affected component/components
Item

How to reproduce:

<Item variant="outline" role="listitem" asChild>
  <Link href={href}>
    <ItemContent>
      {/* ... */}
    </ItemContent>
  </Link>
</Item>

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