roll: third_party/pigweed 5 commits

3d3846b9188822b pw_boot: Remove backend multiplexer
60532cd8bdd59fe pw_sync: Remove multiplexers
630750e177353d5 pw_cpu_exception_cortex_m: rm backend multiplexer
f437033232f7e9b bazel: Add clippy to CI
d1caa98c216d9f4 pw_build: Add optional working directory arg to Bu

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 74612309f33820a..3d3846b9188822b
Roller-URL: https://ci.chromium.org/b/8744120534872987345
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I9348440bc8e5e26cbec6d32ce0b42a615d35133f
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/218256
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
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/third_party/pigweed b/third_party/pigweed
index 7461230..3d3846b 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 74612309f33820a6aab168cc8ed05588a9047d49
+Subproject commit 3d3846b9188822b02068a8addcc4677a52cbbcba