roll: third_party/pigweed 340d624..d5e8fff (2 commits)

d5e8fff:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/237952 pw_toolchain: Fix sysroot data arg for clang-tidy
8b3ecac:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/236794 bazel: Specify a cache silo key

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 340d624033ce86..d5e8fffc6b3e0e
Roller-URL: https://ci.chromium.org/b/8735795196382364113
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I6322cbb61444f6caf2482fbd3a2e43500f4c423b
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/237898
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 340d624..d5e8fff 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 340d624033ce868595ef6ffba77f2e2dd33d65ec
+Subproject commit d5e8fffc6b3e0e20ec26bed082ad0691855adafd