[roll third_party/pigweed] roll: rbe-client

From: git_revision:b4551962f5aa902a5983db2ccf065259ad9f1e81
To: git_revision:bbfff8b0a8701cebd503d961c99e9587605b19e2

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/40540

third_party/pigweed Rolled-Commits: 1c670a2693ab23c..597ac2a7e9ec542
Roller-URL: https://ci.chromium.org/b/8850250897655727264
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8850250897655727264
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I9705e5b817793fd2ca5223ced71891128237feab
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/40541
Reviewed-by: 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 1c670a2..597ac2a 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 1c670a2693ab23c6d890f1f8d2310ba2b9db72ec
+Subproject commit 597ac2a7e9ec542a61c48f6e3c58c06132ed6a0c