roll: third_party/pigweed 57b4f2e..ffb4561 (4 commits)

ffb4561:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/504145 pw_ghish: Scope @owners on merge commits and prefer recent file authors
c669565:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/501419 pw_result: Fix implicit conversion warnings
cb1d237:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/502094 pw_ghish: Honor BUILD_WORKING_DIRECTORY when run via Bazel
2f150d4:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/499154 pw_status, pw_result: Preserve derived status state

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 57b4f2eff50099..ffb456171b053a
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8667819118077735217
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I8a350d56654e1ed08dd0a8a0c3214ddaf67ede4c
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/505005
diff --git a/third_party/pigweed b/third_party/pigweed
index 57b4f2e..ffb4561 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 57b4f2eff500996a9a2f5a9c1e4b6b75539293e1
+Subproject commit ffb456171b053ad8d3953678171602a28022e5d0