[roll] Roll fuchsia [include_working_dir] Update syn to v2

Original-Bug: 332277415
Test: fx build
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1142195
Original-Revision: 187e588449f00082c6ba95075ce7062ed4effce0
GitOrigin-RevId: 6e218200868037811651359a75f1c61e4a1c7840
Change-Id: I2422439a904f1805cdf80bc864fc647dbf2c2952
diff --git a/stem b/stem
index 6ddfe00..8f582f9 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="7703adb2d1edd7ee42d07783b69b5e3fe4d2ef73"/>
+             revision="187e588449f00082c6ba95075ce7062ed4effce0"/>
   </projects>
   <hooks>
     <hook name="install-environment"