[roll third_party/pigweed] pw_bluetooth_proxy: Add maybe_unused to make downstream happy

Original-Bug: 344031126
Original-Bug: 326499764
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/214360
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 7ddafaf90088efa..da7ee077f24a9bb
Roller-URL: https://ci.chromium.org/b/8745902545616635937
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Icdcd9fff27831fe63baec954331098a0104166c9
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/quickstart/bazel/+/214411
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 7ddafaf..da7ee07 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 7ddafaf90088efac4c1bc6a56f92f9faa85fdc84
+Subproject commit da7ee077f24a9bbaa20d31e59ee62d3cd74b1d00