docs: fix role button cursor selector

[Sean-Kenneth-Doherty]

What changed

• Updated the upgrade guide role="button" cursor example to check aria-disabled="true" instead of :disabled.

Why

Elements using role="button" are often non-form elements, so :disabled does not model their disabled state. The docs already use quoted aria-disabled="true" selectors elsewhere, so this keeps the example aligned with ARIA disabled state styling.

Fixes #2460.

Validation

• pnpm install --frozen-lockfile
• pnpm exec prettier --check src/docs/upgrade-guide.mdx
• git diff --check
• pnpm exec eslint src/docs/upgrade-guide.mdx (passes with the repo config ignoring this MDX file)
• SHARP_IGNORE_GLOBAL_LIBVIPS=1 pnpm run build

Note: pnpm run lint currently reports unrelated repo-wide ESLint errors outside this MDX change.

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