roll: third_party/pigweed pw_grpc: Make window update less chatty

Track recv window and don't send window update till we reach half empty

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/287175
Tests-Not-Needed: Austin Foxley <afoxley@google.com>
Original-Revision: a5a09589881b2bd348eafe85e5944c7361613e4d

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 01610a739b206d..a5a09589881b2b
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8715652802455830689
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I8aad89417278b18e136d61f0ba143c7aadbfab9b
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/289172
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 01610a7..a5a0958 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 01610a739b206dbb6c81e8d3e88594ca6b670bc3
+Subproject commit a5a09589881b2bd348eafe85e5944c7361613e4d