Roll Flutter from ea5af273dd7a to 6b6030cb39da (1 revision) (#1746)

diff --git a/.ci/flutter_master.version b/.ci/flutter_master.version
index 55ded7f..f841f31 100644
--- a/.ci/flutter_master.version
+++ b/.ci/flutter_master.version
@@ -1 +1 @@
-ea5af273dd7a4da86cd1633fae04160fd62869b0
+6b6030cb39da7511e5ca6a015cfd41c8afa829d8