Roll Flutter from 23b9d4f1f2f2 to bc0ec85717de (1 revision) (#1396)

diff --git a/.ci/flutter_master.version b/.ci/flutter_master.version
index c8c598c..1168be5 100644
--- a/.ci/flutter_master.version
+++ b/.ci/flutter_master.version
@@ -1 +1 @@
-23b9d4f1f2f2ba86d273089f52668f90694f3e03
+bc0ec85717de14677a0253814faead368ac2abe8