[roll third_party/pigweed] pw_env_setup: Add helper to install CIPD hook

Add a helper in util.sh to install the CIPD post-checkout hook. It's not
used anywhere, but downstream projects can add it to their local copy of
bootstrap.sh.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/105165

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: abed81c4ef1ede9..ca6de894c97c714
Roller-URL: https://ci.chromium.org/b/8806636461872933649
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8806636461872933649
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I29c3035210e2f9f818b3b03faa551fe6cb091603
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/105225
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 abed81c..ca6de89 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit abed81c4ef1ede956e49ec3f972c5b929e28aa8a
+Subproject commit ca6de894c97c7149d8fb1b8140130cf789c25ec7