[roll third_party/pigweed] pw_sync: Test Borrowable with Mutex, TimedMutex, and InterruptSpinLock

Original-Bug: b/261078330
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/153575

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 3db851cdbd209e9..b8d6d511016b2e8
Roller-URL: https://ci.chromium.org/b/8772759488230777841
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I127c89b194588e289032bfcf23f1bc003983e3bb
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/165990
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 3db851c..b8d6d51 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 3db851cdbd209e94a271c1a7714e4e982ff9b6ba
+Subproject commit b8d6d511016b2e86a987a475bcf5a53f1beae290