roll: gn

From: git_revision:5d8727f3fbf420538ff753ebc3ce96da28e12c22
To: git_revision:e4702d7409069c4f12d45ea7b7f0890717ca3f4b
Roller-URL: https://ci.chromium.org/b/8765871882119167505
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ic9ae2ba8e20c347f937a4e4856d4be565e07d0a7
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/178270
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
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 7a6cf8d..08fff04 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
@@ -10,7 +10,7 @@
         "windows-amd64"
       ],
       "tags": [
-        "git_revision:5d8727f3fbf420538ff753ebc3ce96da28e12c22"
+        "git_revision:e4702d7409069c4f12d45ea7b7f0890717ca3f4b"
       ],
       "version_file": ".versions/gn.cipd_version"
     },