[roll] Roll cobalt Test source generator on all projects

Runs source generator for all output types for all projects.
Additionally, compiles the generated c++ and rust code.

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/cobalt/+/543606
Original-Revision: 9f47966976c6a2a3eecf47b203f8b6efacf186cb
GitOrigin-RevId: 52fb9c8ca6e36cfec9f0130edb6abddf701cbaab
Change-Id: Ic636aa9fb401b506acf6d660f6d5a8e1d88cd2d9
diff --git a/third_party/flower b/third_party/flower
index 95b1867..9879c15 100644
--- a/third_party/flower
+++ b/third_party/flower
@@ -60,7 +60,7 @@
     <project name="cobalt"
              path="third_party/cobalt"
              remote="https://fuchsia.googlesource.com/cobalt"
-             revision="1a2281f4ea1f6e9d260323c17df37009d2dd93d7"
+             revision="9f47966976c6a2a3eecf47b203f8b6efacf186cb"
              gerrithost="https://fuchsia-review.googlesource.com"/>
     <project name="cobalt-registry"
              path="third_party/cobalt_config"