SkeletonTableHeader: DOM validation error -- `<th>` as a descendant of `<th>`

Passing an array of `<Th>` elements as a `columns` prop to SkeletonTable causes a DOM validation error -- `<th>` as a descendant of `<th>`.

Example from documentation is a good minimal reproducible example: https://www.patternfly.org/extensions/component-groups/skeleton-table/react/customizable-column-headers/

Although the warning does not show on that page, since that is a production build.