roll: third_party/pigweed 4bb2686..f9979ae (4 commits)

f9979ae:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/275412 pw_config_loader: Remove toml loader
fd015fe:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/275052 pw_trace_tokenized: Add trace_time label flag
3016e5f:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/274963 pw_trace_tokenized: Update OWNERS
992ca19:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/275012 pw_build: Add PW_MUST_NOT_PLACE

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 4bb2686b713f69..f9979ae9110b65
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8720552326312253473
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Iedb81796d9e2f7af024230d272a5d1f45afc1e77
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/275182
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 4bb2686..f9979ae 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 4bb2686b713f6903686ffd5f774ffd921551ea3d
+Subproject commit f9979ae9110b650072b463392c72ae536763718b