roll: third_party/pigweed roll: bazel

Roll Bazel just one commit forward on the main branch, to force all
Bazel servers in infra to restart, hopefully refreshing Bazel's memory
of what is or is not in the cache.

Original-Bug: 369413203
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/237954
Original-Revision: 8c7b09401b950d46233ba4b6c0a2783fa429543e

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: a78ddd06be398f..8c7b09401b950d
Roller-URL: https://ci.chromium.org/b/8735783894896447249
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I27a0595a99cc26431d16ce0369f6bcf528066f5a
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/237903
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index a78ddd0..8c7b094 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit a78ddd06be398fd4cd0289dd6b514c9325e513bc
+Subproject commit 8c7b09401b950d46233ba4b6c0a2783fa429543e