Roll Flutter from 89d9880f46e0 to 47fc19314946 (4 revisions) (#2697)

diff --git a/.ci/flutter_master.version b/.ci/flutter_master.version
index f1a12af..e700fe6 100644
--- a/.ci/flutter_master.version
+++ b/.ci/flutter_master.version
@@ -1 +1 @@
-89d9880f46e066f79bdf6da19bd44edfaa64c041
+47fc193149460fe45d0b68b0168f00cf52f6a3dd