[roll third_party/pigweed] pw_containers: Avoid undefined behavior

This change removes undefined behavior in
`list.erase_after(list.before_begin());` and
`list.insert_after(list.before_begin());`.

Tested by running intrusive_list_test.cc with ubsan.

Original-Fixed: 525
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/69421

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 1f4864873cb73d8..bcabcd78d99dcd4
Roller-URL: https://ci.chromium.org/b/8830280160633754561
Cq-Cl-Tag: roller-builder:pigweed-sample-project-roller
Cq-Cl-Tag: roller-bid:8830280160633754561
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I173afe1b13299573568a9590d64882a7b81735fb
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/sample_project/+/69640
Bot-Commit: 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 1f48648..bcabcd7 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 1f4864873cb73d88c2220df4812bde6e751409d5
+Subproject commit bcabcd78d99dcd4763e6d79c0d2459ade8c6348d