[roll third_party/pigweed] pw_software_update: Add credit to TUF spec

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/58201

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 0a58c02465f6763..f5eba290689dbf3
Roller-URL: https://ci.chromium.org/b/8837622602002664033
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8837622602002664033
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I72c484efc6c8318296c5ec2b993312d1a6999624
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/58901
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 0a58c02..f5eba29 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 0a58c02465f6763dbd319176b6aeb5606bcce699
+Subproject commit f5eba290689dbf3e4c0d4a0836926ffa629427f4