usePagination does not update when the total number of issues changes

Currently, the [usePagination](https://github.com/dequelabs/cauldron/blob/develop/packages/react/src/components/Pagination/usePagination.tsx) hook does not gracefully handle when the total number of issues changes, which makes it unusable in situations where the items are filtered.

If `totalItems` changes to a number that would make the `currentPage`, `pageStart` , or `pageEnd` invalid (such as by changing to a smaller number of total items resulting in `currentPage` being higher than the total number of items), then the pagination state should update to valid values.

If the `currentPage` is higher than the total number of items, it should update to the last valid page, or the first page if the total number of items is `0`.