Roll Flutter from 70349f875435 to e5cf7d1833a6 (2 revisions) (#618)

diff --git a/.ci/flutter_master.version b/.ci/flutter_master.version
index 905efc5..0a6a9b1 100644
--- a/.ci/flutter_master.version
+++ b/.ci/flutter_master.version
@@ -1 +1 @@
-70349f875435451e6e16392a75f703a1b41cbb24
+e5cf7d1833a6a25622e4197844d5533fd465569c