[flutter_tool] Move http request close under try-catch (#38894)

https://dart.googlesource.com/external/github.com/flutter/flutter/+/28bedb10dac5cefa8e63bac76e483220644fad54
diff --git a/commits.json b/commits.json
index ea7e024..d9484b9 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
   "external/github.com/flutter/engine":"a6cd477f543a863fc44803cf7db2e39a19ba97dd",
-  "external/github.com/flutter/flutter":"c20113e246cb5c13fca14740cf471ba08efdd927",
+  "external/github.com/flutter/flutter":"28bedb10dac5cefa8e63bac76e483220644fad54",
   "sdk":"d95bb2d74fa8ed4ec1d9fb6a7b6aef96895d6799"
 }
\ No newline at end of file