[roll third_party/pigweed] pw_json: Classes for serializing JSON

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/190458

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 1ac49bcda648d72..36b6a7ddb0c28b6
Roller-URL: https://ci.chromium.org/b/8755526707768756241
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I913e66eeaf0ec61e13c47e7fbf0bc1d7852514db
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/193318
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.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 1ac49bc..36b6a7d 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 1ac49bcda648d72702980d5fa5604f7f02644fa6
+Subproject commit 36b6a7ddb0c28b66a6d3420b99104a5869f37363