[roll third_party/pigweed] pw_rust: Update @rust_crates sha

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/155051

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 29a2140fcebf8b0..35caee12f9a7906
Roller-URL: https://ci.chromium.org/b/8775284985873610097
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I7e0c6b2fb74691c953e09280ab389ffac0ed5455
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/156490
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 29a2140..35caee1 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 29a2140fcebf8b0e118aae3541a83e63f91d0560
+Subproject commit 35caee12f9a790647a864b384b21aa8fc5e7880b