[roll third_party/pigweed] pw_env_setup: Add clang_next.json

Original-Bug: b/295020927
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/163810

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: f96fd31675d136b..3545ad301dc711b
Roller-URL: https://ci.chromium.org/b/8773290292211478545
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Id9ae5c2b4c2bf547539fea298f7e0a899183c806
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/164230
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index f96fd31..3545ad3 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit f96fd31675d136bd37a7f3840102cb256d555cea
+Subproject commit 3545ad301dc711bc4400a110ba43f86ba1aa34c3