Roll Flutter from 720806501997 to c82ddd39e54f (1 revision) (#1357)

diff --git a/.ci/flutter_master.version b/.ci/flutter_master.version
index 8c7825a..c1bada3 100644
--- a/.ci/flutter_master.version
+++ b/.ci/flutter_master.version
@@ -1 +1 @@
-7208065019976c9e80b422583001b3779838d881
+c82ddd39e54fed2401e8b89dd82960d6ac9717d3