fix(embedded): Remove CSRF requirement for dashboard download API (#2…

…9953)

superset/config.py

@@ -258,6 +258,7 @@ def _try_json_readsha(filepath: str, length: int) -> str | None:
     "superset.views.core.log",
     "superset.views.core.explore_json",
     "superset.charts.data.api.data",
+    "superset.dashboards.api.cache_dashboard_screenshot",
 ]
 
 # Whether to run the web server in debug mode or not