Roll Flutter from efb9368573f6 to b5adbee145fd (10 revisions) (#5830)

diff --git a/.ci/flutter_master.version b/.ci/flutter_master.version
index 6b6ab9a..d6c773a 100644
--- a/.ci/flutter_master.version
+++ b/.ci/flutter_master.version
@@ -1 +1 @@
-efb9368573f605fdf63b6143d7a352b400805a72
+b5adbee145fd99d72af8b5829ce2c7a6acf5ed53