[third_party/pigweed] Roll 2 commits

8c5103f3da47d9c pw_grpc: Remove old constructor after migration
962861dc8e2714c pw_build: CMake recipe for the pw build command

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 5bda8d1632020bd..8c5103f3da47d9c
Roller-URL: https://ci.chromium.org/b/8749097128244240705
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Id903d6a65bea4b5df32091dd6ef49ebd981222fd
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/207581
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 5bda8d1..8c5103f 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 5bda8d1632020bdcd2839ddeefdc796319499152
+Subproject commit 8c5103f3da47d9c02e9d66f57ce6a71b1fadce32