[roll third_party/pigweed] pw_software_update: Verify target payloads

Original-Bug: 456
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/62021

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 16f00aa01532c81..d0997578b9635bb
Roller-URL: https://ci.chromium.org/b/8827917148669429601
Cq-Cl-Tag: roller-builder:pigweed-sample-project-roller
Cq-Cl-Tag: roller-bid:8827917148669429601
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I347e301edd0a4e0440b7277c4d681874487c1d7c
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/sample_project/+/74020
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 16f00aa..d099757 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 16f00aa01532c8111e925f31a0265860e8db6939
+Subproject commit d0997578b9635bbf8c0bd783cb7ae6b24433ddee