[roll third_party/pigweed] pw_transfer: Prevent accidental timeouts in unit tests

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/180274

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 83707d83614162f..563393f56a8c41b
Roller-URL: https://ci.chromium.org/b/8764855997342332673
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I58c113f95818c42ff79dfb768bf4eecdee0f5a4c
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/180430
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 83707d8..563393f 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 83707d83614162fa1cb9085abf3078dab59d94e3
+Subproject commit 563393f56a8c41b03aed3e99e37993fb1c5c0dc8