roll: third_party/pigweed 65f7097..2a19596 (4 commits)

2a19596:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/429952 pw_async2: Clean up coroutine deallocation
fbc1b56:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/422712 roll: Clang and Rust toolchain packages
1a3fe75:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/428672 third_party: Add prost-reflect crate
81bf56e:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/418754 pw_kernel: Add tracing test for each architecture

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 65f7097ea7a321..2a19596193d1fc
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8676980876651456881
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ia0734b78739a6fafe251a8e91e90bfd7378c65f4
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/432932
diff --git a/third_party/pigweed b/third_party/pigweed
index 65f7097..2a19596 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 65f7097ea7a321d0316f5a6c5fe0a2ebaa3cc9df
+Subproject commit 2a19596193d1fc46dd3238cb4a037fb92afe0861