fix: faster search for Change Dataset modal (#12669)

diff --git a/superset-frontend/src/datasource/ChangeDatasourceModal.tsx b/superset-frontend/src/datasource/ChangeDatasourceModal.tsx
index 0d5d36d..5c144e4 100644
--- a/superset-frontend/src/datasource/ChangeDatasourceModal.tsx
+++ b/superset-frontend/src/datasource/ChangeDatasourceModal.tsx
@@ -133,7 +133,7 @@
         }),
       });
     },
-    1000,
+    300,
     [filter],
   );