[roll third_party/pigweed] pw_transfer: Limit to sending a single chunk in tests

This updates a flaky transfer unit test to ensure that only one chunk is
ever sent, to prevent an unexpected payload if the test takes longer to
run.

Original-Bug: b/295037376
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/182665

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 89588329bfc42c9..d11691777400232
Roller-URL: https://ci.chromium.org/b/8763238362844910785
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Id3a540023aaa27e361589905c4b966b8a6c688b4
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/182694
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 8958832..d116917 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 89588329bfc42c935cb1c77e996a495700e62eda
+Subproject commit d1169177740023242a0efd8a2f13a436c5abf9b2