[roll third_party/pigweed] pw_env_setup: Add new roller SA to OWNERS

Add new roller service account to OWNERS. Limit ownership to just the
necessary directory.

Original-Bug: b/240166082
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/150613

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: c488b781930b223..205c15164945aec
Roller-URL: https://ci.chromium.org/b/8779105155752366689
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I6e8ffcdd3aed26a8a99b303c05af9acceab0cdb2
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/150632
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index c488b78..205c151 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit c488b781930b223918e845efd5fa434f090aa882
+Subproject commit 205c15164945aecdd8dfc179c917616bc5388e56