[roll third_party/pigweed] roll: rust

From: git_revision:5197c96c49fc3b7de3ce9a31f7cc62d2cbd1f70c
To: git_revision:672831a5c890f51d3222511ab2575ca7a86c8e20

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/110790
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed.google.com.iam.gserviceaccount.com>

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: e76c4cf4f1b6963..842745e5347b3cf
Roller-URL: https://ci.chromium.org/b/8802761187811918129
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ic9c8549bf44cabd05dc3170dbfc1c89f386c7193
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/110810
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index e76c4cf..842745e 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit e76c4cf4f1b6963e1a75ccaeb4f08c4ae9191a0f
+Subproject commit 842745e5347b3cf416d58b0f85f79c3f0d2298d1