roll: gn

From: git_revision:b6203d186bff6b39ac25af6c1e80e1d3f96c949a
To: git_revision:46ad4c45254d1d72d25a36f1ef3fd61694e34f49

CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Idd268bb70bb3cd08502cae6c0ba9cb257c47f3ff
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/13787
Reviewed-by: Pigweed Roller <pigweed-roller@pigweed.google.com.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed.google.com.iam.gserviceaccount.com>

pw_env_setup/py/pw_env_setup/cipd_setup/pigweed.json

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 7854495..7e84617 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:b6203d186bff6b39ac25af6c1e80e1d3f96c949a"
+      "git_revision:46ad4c45254d1d72d25a36f1ef3fd61694e34f49"
     ]
   },
   {