[third_party/pigweed] Roll 2 commits

f1ee73c16ce39b9 pw_env_setup: Upgrade PyYAML to 6.0.1
a4fd44bd4568de9 pw_hdlc: Add target to Bazel build

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: a43abffec2d1eaa..f1ee73c16ce39b9
Roller-URL: https://ci.chromium.org/b/8775018459352149921
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ifa7441ec5408c59615a5b4f4d166214bfe8fa163
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/157577
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 a43abff..f1ee73c 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit a43abffec2d1eaa0c88d20ef448349ebca937803
+Subproject commit f1ee73c16ce39b95126f7e16f176995daf1c92e5