Fix AnimationStatus for repeat(reverse: true) and animateWith (#37739)

https://dart.googlesource.com/external/github.com/flutter/flutter/+/6d3c5381c7e054f26f9cd7e9526e6d479323f00b
diff --git a/commits.json b/commits.json
index 89d2ba5..f6fe2b7 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
   "external/github.com/flutter/engine":"a6cd477f543a863fc44803cf7db2e39a19ba97dd",
-  "external/github.com/flutter/flutter":"4bffe3dd1dff6f168c06f714ebcd87fc3fd9cc2f",
+  "external/github.com/flutter/flutter":"6d3c5381c7e054f26f9cd7e9526e6d479323f00b",
   "sdk":"72923471c4717821255c055574b05db05ee4cafd"
 }
\ No newline at end of file