roll: third_party/pigweed c376a00..6fd39ed (3 commits)

6fd39ed:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/306078 pw_compilation_testing: Implement PW_NC_TEST in Bazel
148f0d0:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/324532 pw_grpc: Account for gRPC header in flow control window
440ea6d:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/322432 pw_ide: Add Help section along with a welcome header

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: c376a001f909a8..6fd39edf919a4a
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8702981991544021313
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ia2c8908d91987d9b6423240d1a08cccaf953e204
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/324506
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 c376a00..6fd39ed 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit c376a001f909a8a56ff3e9a082920280e32fce43
+Subproject commit 6fd39edf919a4a3cd7ed9776f6c8f092189fd815