Add boxes around version freshness alerts (#96152)

https://dart.googlesource.com/external/github.com/flutter/flutter/+/3c0f3f4ee18e457cd7d4376fc19499d2ae66ca5b
diff --git a/commits.json b/commits.json
index 78f3689..641efa8 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
   "external/github.com/flutter/engine":"31b1a1d05803ec9fa25ae0f7b2b0f078ff3980b1",
-  "external/github.com/flutter/flutter":"5d5958f3588ee1ed25e31445d4b74b2a52c1025d",
+  "external/github.com/flutter/flutter":"3c0f3f4ee18e457cd7d4376fc19499d2ae66ca5b",
   "sdk":"df2e8fedbbe23e5a79dbda114c2ff3c115ac85a1"
 }
\ No newline at end of file