roll: third_party/pigweed 8fddf43..e1736b9 (3 commits)

e1736b9:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/254432 pw_toolchain: Transition flag to update rules_cc
3e5208e:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/254476 zephyr: Update to support 4.0
d7fcaef:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/255392 pw_rust: Allow override proc_macro toolchain

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 8fddf43470a722..e1736b97037c03
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8728189256148919601
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I16dbfd3650b66e4512fe2fe55305ae2518848a3f
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/255533
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 8fddf43..e1736b9 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 8fddf43470a722fc398eb7b1c5a261de3a0bc52b
+Subproject commit e1736b97037c032e7845b0499752675c00156602