chore: rm proptypes for DownloadDats component

this is more narrowly specified by the TypeScript prop type anyway.

src/js/components/Provenance/DownloadDats.tsx

@@ -1,5 +1,4 @@
 import { useCallback } from 'react';
-import PropTypes from 'prop-types';
 import { Button, Space } from 'antd';
 import { DownloadOutlined } from '@ant-design/icons';
 
@@ -25,8 +24,4 @@ const DownloadDats = ({ metadata }: { metadata: ProvenanceStoreDataset }) => {
   );
 };
 
-DownloadDats.propTypes = {
-  metadata: PropTypes.object.isRequired,
-};
-
 export default DownloadDats;