Roll Flutter from 4cea9afc1224 to 5b713147404d (4 revisions) (#5441)

diff --git a/.ci/flutter_master.version b/.ci/flutter_master.version
index d7dca8a..6aede9c 100644
--- a/.ci/flutter_master.version
+++ b/.ci/flutter_master.version
@@ -1 +1 @@
-4cea9afc12243850d4776003349fb9cff4c031fc
+5b713147404d076f1a955bdb0becdd5fca816ed1