Roll Flutter (stable) from d3b14c876900 to 9584c6713b32 (15 revisions) (#12854)

https://github.com/flutter/flutter/compare/d3b14c876900...9584c6713b32

If this roll has caused a breakage, revert this CL and set the roller
to dry run mode using the controls here:
https://autoroll.skia.org/r/flutter-stable-packages
Please CC boetger@google.com,stuartmorgan@google.com on the revert to ensure that a human
is aware of the problem.

To file a bug in Flutter (stable): https://github.com/flutter/flutter/issues/new/choose
To file a bug in Packages: https://github.com/flutter/flutter/issues/new/choose

To report a problem with the AutoRoller itself, please file a bug:
https://issues.skia.org/issues/new?component=1389291&template=1850622

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md
diff --git a/.ci/flutter_stable.version b/.ci/flutter_stable.version
index e254bee..d81d64b 100644
--- a/.ci/flutter_stable.version
+++ b/.ci/flutter_stable.version
@@ -1 +1 @@
-d3b14c876900e553bc736ca19295fc09e3853e8e
+9584c6713b324636289d067944a46fd6b49df14b