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

Updates the ManualCancel_Duplicate test to only request a single chunk
from the client, preventing flakes due to unexpected data and TSAN
issues from concurrent writes. This fix was previously applied to
similar tests.

Bugs: 321825133
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/192510

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: b482f964bd56b7f..25319124e0d486e
Roller-URL: https://ci.chromium.org/b/8756093009070287137
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Idab4c6210fa4efc0ab93604775530a49948a6902
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/192443
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 b482f96..2531912 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit b482f964bd56b7ffb7ba4cbd1f8e1c3ed82345cf
+Subproject commit 25319124e0d486ef3a60d45750e6387f487ffc6b