roll: third_party/pigweed 7940ef2..c3fd517 (6 commits)

c3fd517:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/258173 pw_bluetooth_proxy: Use switch statement with H4PacketType
8706efb:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/258392 pw_protobuf: Allow unset callback fields in message structs
bfe2c77:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/256693 docs: Move bug directive
dbf07bb:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/258393 pw_toolchain: Add manual tag to supports_pic_old
924b629:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/256835 fuchsia_sdk: Use toolchain defined in rules_fuchsia
e5e913d:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/256373 [owners] Remove luluwang@google.com from pw_bluetooth_proxy/OWNERS

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 7940ef25e097da..c3fd51718227f1
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8726460150305159441
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I584fcd15fbf1e4f3f09a9d21ee0440c15a07b068
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/258433
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 7940ef2..c3fd517 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 7940ef25e097dae964b4e07004ad70942a9b0473
+Subproject commit c3fd51718227f1c556db80cc18383be0c54cb438