[roll] Roll fuchsia [superproject] Roll third_party/pigweed pw_unit_test: Fix -Waddress warning when verifying RUN_ALL_TESTS

When Google Test back-end is used for pw_unit_test GCC reports warning
as follows:

pw_unit_test/public/pw_unit_test/framework.h:181:30: error: the address of 'int RUN_ALL_TESTS()' will never be NULL [-Werror=address]

This happens only with Google Test back-end, because pw_unit_test uses
"#define RUN_ALL_TESTS() ..." and in such case the static_assert is not
used.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/243133
Original-Revision: a4636bc83d6905cb252a65d19eab4ec2478af42b
GitOrigin-RevId: f4c8e93e87245a4d4c1e82bb9a16514990c42dea
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1142099
Original-Revision: f6456ff926fa54bd0250bd567891aeead1d4ebb9
Change-Id: I7b353093b4de1632483ca4e7b0455607936bc58c
diff --git a/stem b/stem
index ce4e8d6..f0862aa 100644
--- a/stem
+++ b/stem
@@ -11,7 +11,7 @@
              githooks="integration/git-hooks"
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="73b83496c88551f7a0e14b19cfc35fd65aa89ec3"/>
+             revision="f6456ff926fa54bd0250bd567891aeead1d4ebb9"/>
   </projects>
   <hooks>
     <hook name="install-environment"