roll: third_party/pigweed 2 commits

81aad1379cb7f23 pw_result: Add missing header
9d900358e89d603 pw_{kvs,result,tokenizer,unit_test}: Missing <stri

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 789f3ef5abc6b6e..81aad1379cb7f23
Roller-URL: https://ci.chromium.org/b/8742240401497066817
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Id14077d9863f570e246b259ea87c5ca7400109d0
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/223551
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 789f3ef..81aad13 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 789f3ef5abc6b6efd82ef896020ada8ef177f6da
+Subproject commit 81aad1379cb7f230793d97aca25012476f07dde0