roll: third_party/pigweed 76f7aa2..c409392 (3 commits)

c409392:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/235493 pw_bluetooth_sapphire: Fix unused parameter warnings
758d608:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/249972 pw_protobuf: Respect max_count when computing kMaxEncodedSizeBytes
c389296:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/248152 bazel: Minor WORKSPACE cleanup

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 76f7aa25d19c61..c40939242de4c9
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8730799906843297249
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I40500b83e7f4a51be42fed78bd64ac843370042e
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/250195
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 76f7aa2..c409392 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 76f7aa25d19c612ff632f60ee7660ccbd3620405
+Subproject commit c40939242de4c9754ea58d362cca5fb172f0f8b6