Hotfix to make sitemap accessible again.

simplesitemap.routing.yml

 simplesitemap.sitemap:
- path: '/sitemap.xml'
- defaults:
-   _controller: '\Drupal\simplesitemap\Controller\SimplesitemapController::get_sitemap'
- requirements:
-   _permission: 'TRUE'
+  path: '/sitemap.xml'
+  defaults:
+    _controller: '\Drupal\simplesitemap\Controller\SimplesitemapController::get_sitemap'
+  requirements:
+    _access: 'TRUE'
 
 simplesitemap.chunk:
- path: '/sitemaps/{sitemap_id}/sitemap.xml'
- defaults:
-   _controller: '\Drupal\simplesitemap\Controller\SimplesitemapController::get_sitemap'
- requirements:
-   _permission: 'TRUE'
+  path: '/sitemaps/{sitemap_id}/sitemap.xml'
+  defaults:
+    _controller: '\Drupal\simplesitemap\Controller\SimplesitemapController::get_sitemap'
+  requirements:
+    _access: 'TRUE'
 
 simplesitemap.settings:
- path: '/admin/config/search/simplesitemap'
- defaults:
+  path: '/admin/config/search/simplesitemap'
+  defaults:
     _form: '\Drupal\simplesitemap\Form\SimplesitemapSettingsForm'
     _title: 'Simple XML Sitemap Settings'
- requirements:
-   _permission: 'administer sitemap settings'
+  requirements:
+    _permission: 'administer sitemap settings'
 
 simplesitemap.settings_custom:
   path: '/admin/config/search/simplesitemap/custom'
   defaults:
-     _form: '\Drupal\simplesitemap\Form\SimplesitemapCustomLinksForm'
-     _title: 'Simple XML Sitemap Settings'
+    _form: '\Drupal\simplesitemap\Form\SimplesitemapCustomLinksForm'
+    _title: 'Simple XML Sitemap Settings'
   requirements:
     _permission: 'administer sitemap settings'