[roll third_party/pigweed] pw_software_update: Fix bugs in update_bundle.py

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/61300

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 62de7c435b12234..eaf1e547f52b390
Roller-URL: https://ci.chromium.org/b/8835819475167555793
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8835819475167555793
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I57e45edc669e06a870c937ea4bbf6ca5bac255a0
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/61361
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 62de7c4..eaf1e54 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 62de7c435b12234795613556e34f9fffa586f0b4
+Subproject commit eaf1e547f52b39005fad42ee04f36084859109e3