roll: third_party/pigweed: pw_bluetooth_proxy: Include <optional> in proxy_host.h

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/220657
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: a4f432177a7e2cf..858b5b2a275d57f
Roller-URL: https://ci.chromium.org/b/8742926328623065825
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I3bb3bd50cdf0f7268ed2f18e42e0a26183a4b5f4
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/220659
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 a4f4321..858b5b2 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit a4f432177a7e2cf41fa374af909d47a720fac133
+Subproject commit 858b5b2a275d57f35cc9e0e049a6c16e3b23d0bf