roll: third_party/pigweed 4 commits

a7e3e716c1bab31 pw_multibuf: Cast std::distance() to size_t to avo
005ddffe18732af pw_build: Introduce config for enabling -Wshadow-a
dfc2231c5e45b09 docs: Add shortlink for Pigweed Live notes
e41b65bb2813c26 pw_log_zephyr: Make shell printf macros safe for u

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: aa6edfa23113a13..a7e3e716c1bab31
Roller-URL: https://ci.chromium.org/b/8738514998394773841
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I868b4204f659e1449077068d41fb3f5e31070765
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/231999
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 aa6edfa..a7e3e71 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit aa6edfa23113a13509e89e7b9bb1eb35ead991cd
+Subproject commit a7e3e716c1bab31544b7ca37804fe7ca52c0f0dc