[roll third_party/pigweed] pw_transfer: Make TransferClientTest manual

Followup to pwrev/97566: need to mark the test_suite manual as well to
exclude it from CI/CQ.

Tested:
By running `bazel test //pw_transfer/...:all`

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/97574

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: aede0088576a738..a6e045e78aa8d37
Roller-URL: https://ci.chromium.org/b/8811449811036208081
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8811449811036208081
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I03447af0c8acc4d37350a9ef4cbc5fa5128e739b
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/97891
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 aede008..a6e045e 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit aede0088576a73800e28ae40d3aa505c29901cdf
+Subproject commit a6e045e78aa8d37d5586a36b2aa105a6e3bb265a