Breaking: #101149 - Mark PageTsBackendLayoutDataProvider as final

See forge#101149

Description

The class \TYPO3\CMS\Backend\View\BackendLayout\PageTsBackendLayoutDataProvider is marked as final.

Impact

It is no longer possible to extend the class \TYPO3\CMS\Backend\View\BackendLayout\PageTsBackendLayoutDataProvider.

Affected installations

Classes extending \TYPO3\CMS\Backend\View\BackendLayout\PageTsBackendLayoutDataProvider.

Migration

Instead of extending the data provider, it is recommende to register a custom DataProvider for Backend Layouts, which can already be used since TYPO3 v7.