[roll] Roll fuchsia [debugger] Fix test flake.

This test code mixes a signed type with the unsigned constructor. This
prints an assertion failure every time in debug mode, but it seems the
test framework doesn't always catch the assertion.

Original-Bug: 104152
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/699466
Original-Revision: fe4637176e7ea566779ea6c4b5524580cf8b9c05
GitOrigin-RevId: 392ccd13b69f814067f48feaca1c9a38b80038f1
Change-Id: Icc1a04673dabf928e440e56962c3bdd60af0348d

stem

diff --git a/stem b/stem
index 4eb2687..ce5861b 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
              githooks=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="27b4276816ec2b9fda4d890ef148670f7b1ff7ef"/>
+             revision="fe4637176e7ea566779ea6c4b5524580cf8b9c05"/>
   </projects>
   <hooks>
     <hook name="install-environment"