roll: third_party/pigweed 05b1466..ef86a47 (2 commits)

ef86a47:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/246312 pw_bluetooth_sapphire: Remove uses of EventCallbackVariant
19e98dd:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/246272 pw_rpc: Move proto library targets into root directory

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 05b1466ec3a002..ef86a47f690651
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8732438620270229857
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I451d13f3aab7e275b53af2609ad53e3fdd6ab9d7
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/246372
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 05b1466..ef86a47 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 05b1466ec3a0026dceb49a10e4e6052c94f999ac
+Subproject commit ef86a47f69065196b3c5ee0a6b2616e4e3bd553a