roll: third_party/pigweed 45ed65c..8e21d97 (3 commits)

8e21d97:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/247253 pw_bluetooth_sapphire: Remove CommandCompleteCallbackVariant
05c13c4:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/247252 pw_bluetooth_sapphire: Remove more legacy event handling
6aeaef1:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/247232 pw_bluetooth_sapphire: Remove more legacy event infrastructure

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 45ed65c001577d..8e21d974aed972
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8731986559099907841
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I0d1874e28ebcd02887c0aa3f12458bf8d58a3986
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/247513
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 45ed65c..8e21d97 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 45ed65c001577d621206837db89f531aa152ec24
+Subproject commit 8e21d974aed972b995bcd9c87a58a55ad0ab1468