Bump third_party/pigweed/repo from `ee4e09c` to `b5cec17` (#27852)

Bumps [third_party/pigweed/repo](https://github.com/google/pigweed) from `ee4e09c` to `b5cec17`.
- [Commits](https://github.com/google/pigweed/compare/ee4e09ccde34497280b27f41b309a6d59ec44245...b5cec17a34cb4115537141d06c7726392857f678)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
diff --git a/third_party/pigweed/repo b/third_party/pigweed/repo
index ee4e09c..b5cec17 160000
--- a/third_party/pigweed/repo
+++ b/third_party/pigweed/repo
@@ -1 +1 @@
-Subproject commit ee4e09ccde34497280b27f41b309a6d59ec44245
+Subproject commit b5cec17a34cb4115537141d06c7726392857f678