[roll third_party/pigweed] pw_thread_freertos: Add thread snapshot support

Adds Snapshot integration for FreeRTOS thread state.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/53743

third_party/pigweed Rolled-Commits: aa52c4b31f24834..db698f34d139a68
Roller-URL: https://ci.chromium.org/b/8840884849728018192
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8840884849728018192
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ic0d333c709f9fd6a42adbf234b3a05bea36283be
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/54501
Reviewed-by: 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 aa52c4b..db698f3 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit aa52c4b31f2483496a34c379fdcca4bbeece0fe5
+Subproject commit db698f34d139a6836a123f22fff96df1d92b2c9c