roll: gn

From: git_revision:894835059979c99c8551f9d1c72de8f4a11290bc
To: git_revision:200492a501c6c78ebb9aef45e6f231ddfadfe231

CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I56d764520dd3166f5d647d55cdf5b44adbb2b1fb
diff --git a/pw_env_setup/py/pw_env_setup/cipd_setup/pigweed.json b/pw_env_setup/py/pw_env_setup/cipd_setup/pigweed.json
index e8b50ef..6b1c403 100644
--- a/pw_env_setup/py/pw_env_setup/cipd_setup/pigweed.json
+++ b/pw_env_setup/py/pw_env_setup/cipd_setup/pigweed.json
@@ -2,7 +2,7 @@
   {
     "path": "gn/gn/${os}-${arch=amd64}",
     "tags": [
-      "git_revision:894835059979c99c8551f9d1c72de8f4a11290bc"
+      "git_revision:200492a501c6c78ebb9aef45e6f231ddfadfe231"
     ]
   },
   {