roll: third_party/pigweed f107048..1dc9a78 (2 commits)

1dc9a78:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/237953 pw_uart: Add method to set flow control
0e5c336:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/237808 bazel: Upgrade bazel clang version to match the GN version

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: f1070484e7d2f4..1dc9a789f52aad
Roller-URL: https://ci.chromium.org/b/8735702854836177857
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I2298c1411a7a6ab9f9fe0dec2bb9f72658023569
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/238196
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 f107048..1dc9a78 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit f1070484e7d2f4e429332c6d8520a3676b8cb965
+Subproject commit 1dc9a789f52aad1f0e738a1cfd5993e2272c38d2