[roll third_party/pigweed] pw_unit_test: Improve integration test reliability

- Improve logging when the test_run_start message is dropped.
- Add retries with a shorter delay when connecting to a local socket.
  This makes the integration tests run slightly faster and more
  reliably.
- Read from the socket in a thread. This prevents the occasional drops
  that caused rpc_service_test.py to fail.
- Call communicate() instead of just wait() on the server subprocess
  since subprocess.PIPE is used.
- Fix GN host_os check for Windows: "windows" -> "win".

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/56929

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: ee0b1e0779253d6..cf43bbf559ef512
Roller-URL: https://ci.chromium.org/b/8838979242632356881
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8838979242632356881
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I15d660f0f783ec958b71e0de8275973fdfa3643d
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/57081
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 ee0b1e0..cf43bbf 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit ee0b1e0779253d6b0e9c8515822f9b660b94e66a
+Subproject commit cf43bbf559ef5125a1358c382d0c4c36e4bf8817