[roll] Roll fuchsia [phys] Build ZBI executables for x86

Original-Bug: 46879, 49425
Test: new ZBI tests (i.e. existing arm64 phys tests now run on x86 too)
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/395021
Original-Revision: 8311bc4024fd8e1d598266b29fafcfe283f3a05e
GitOrigin-RevId: 1335a028b011bc4e0e007fcf72cabac01dde8a25
Change-Id: I84ec38faa72226724f329bc4b1076858a46d4f7c
diff --git a/stem b/stem
index 60bf2d3..06c8ce2 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
              githooks=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="6c6d1eb35c485c6342e7006b619bfb1723f55e65"/>
+             revision="8311bc4024fd8e1d598266b29fafcfe283f3a05e"/>
   </projects>
   <hooks>
     <hook name="install-fx"