roll: third_party/pigweed ff379a0..279ab4a (2 commits)

279ab4a:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/237809 pw_chrono: Properly stamp build time in Bazel
974dd9e:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/239354 Revert "pw_build: Fix build spew for pw_copy_and_patch_file"

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: ff379a08515bde..279ab4a3554390
Roller-URL: https://ci.chromium.org/b/8735162314007839857
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ia2476471c4833e2407db8ff8a0e95192c562cd03
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/239472
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.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 ff379a0..279ab4a 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit ff379a08515bde8149ec7f65e1ae39371df3166b
+Subproject commit 279ab4a35543900b62e674d14c2e663532ad5a18