roll: third_party/pigweed pw_async2: Use the PendResult and PendOptional aliases

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/312757
Original-Revision: 0524f959b4ee81a2e0237401c3ebd9c0533b10ca

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: e8fd38b6cebd52..0524f959b4ee81
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8706575810165539441
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I4c69fcda0898e65c88596eecc8100da6bf4f97e4
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/313081
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 e8fd38b..0524f95 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit e8fd38b6cebd52249759d7cdc711bce01565ed2f
+Subproject commit 0524f959b4ee81a2e0237401c3ebd9c0533b10ca