Bump third_party/pigweed/repo from `ead209d` to `39f7220` (#24226)

Bumps [third_party/pigweed/repo](https://github.com/google/pigweed) from `ead209d` to `39f7220`.
- [Release notes](https://github.com/google/pigweed/releases)
- [Commits](https://github.com/google/pigweed/compare/ead209d3aa09821aa7549fbc8665ae68fe88d16f...39f72204df9c95c23d1ad4ee34274a116e6aedd7)

---
updated-dependencies:
- dependency-name: third_party/pigweed/repo
  dependency-type: direct:production
...

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Signed-off-by: dependabot[bot] <support@github.com>
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diff --git a/third_party/pigweed/repo b/third_party/pigweed/repo
index ead209d..39f7220 160000
--- a/third_party/pigweed/repo
+++ b/third_party/pigweed/repo
@@ -1 +1 @@
-Subproject commit ead209d3aa09821aa7549fbc8665ae68fe88d16f
+Subproject commit 39f72204df9c95c23d1ad4ee34274a116e6aedd7