[third_party/pigweed] Roll 4 commits

5b4b97ce8950a92 bazel: Don't use llvm_toolchain for fuchsia_clang
6f7fefe19d86fbb rp2040: Temporarily disable remaining failing rp20
e59a11cf80ef7a8 pw_bloat: Build and run `pw bloat` CLI command in
c9d7fa45896c919 pw_transfer: Remove unused imports

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 81797a4675c000d..5b4b97ce8950a92
Roller-URL: https://ci.chromium.org/b/8745379562210054577
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I36c0df587319cf133c1419b6c37da965de23e175
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/215578
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 81797a4..5b4b97c 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 81797a4675c000d374700d0a37288b2d8945dac2
+Subproject commit 5b4b97ce8950a9210e0428cafd49f49e8c68a76f