[roll third_party/pigweed] pw_assert_log: Make assert_log.h accessible

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/47162

third_party/pigweed Rolled-Commits: 76c3a5cd4660a15..405b1468a5b0550
Roller-URL: https://ci.chromium.org/b/8846065029831722656
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8846065029831722656
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I0f91f2455b640b172a309db0390970cf260b8468
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/47090
Reviewed-by: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 76c3a5c..405b146 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 76c3a5cd4660a15509c55b1038e0e1d40c0171ae
+Subproject commit 405b1468a5b0550c27a35733f561828b1c58a38d