[third_party/pigweed] Roll 4 commits

3f89c18fdffd43f pw_module: Jinja template refactor
6222b1097d11fb1 docs: Update reST style guide
c68babc5337f950 pw_async2: Add Poll::Readiness helper
ef7a6d3ac854bea pw_toolchain: Fix Rust GN host build

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 83816fda4ae0793..3f89c18fdffd43f
Roller-URL: https://ci.chromium.org/b/8751555954108275249
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I8d28aa4d68aa10819cefb1e4cc8e27fc66c1b5f3
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/202010
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 83816fd..3f89c18 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 83816fda4ae0793d21e79c1ef90e53fe4176ebe4
+Subproject commit 3f89c18fdffd43f6838307fa5fa8c9900c7b4071