Make scrollbar assertions less aggressive (#84809)

https://dart.googlesource.com/external/github.com/flutter/flutter/+/40d0c69fd67c40737d48e65777fbcaffa793bce5
diff --git a/commits.json b/commits.json
index aaa24bd..82a0456 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
   "external/github.com/flutter/engine":"99b752ed2c8f87bb1d13d89a7cee3fb9caa3b1f2",
-  "external/github.com/flutter/flutter":"604c59e522b2f8493da7c12e36609fe8b2f8ea1f",
+  "external/github.com/flutter/flutter":"40d0c69fd67c40737d48e65777fbcaffa793bce5",
   "sdk":"c015e02180d0e4231eacc71817f6230182203bc2"
 }
\ No newline at end of file