[roll third_party/pigweed] pw_software_update: Disable spurious Pylint error

Followup to
https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/70301.
Removes another spurious pylint error.

Original-Bug: 572
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/70840

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 2b454658f56a49c..f9bd8a17ac96267
Roller-URL: https://ci.chromium.org/b/8829646745224313553
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8829646745224313553
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ie98f58f6c93e8d00200ff597fa262cfb1c5ddea0
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/70881
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 2b45465..f9bd8a1 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 2b454658f56a49c52602a1e58ab7f0715d34ef64
+Subproject commit f9bd8a17ac9626780a97e32e01cc5af3fe10a5c3