[roll third_party/pigweed] pw_unit_test: Check that a test is running when EXPECT is called

Assert that a test is currently running when EXPECT_* or ASSERT_* is
called. Previously, calling EXPECT_* from a static constructor would
silently do nothing since no test event handler was set.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/95700

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: a80b43fb5100f72..732e2248d40de9e
Roller-URL: https://ci.chromium.org/b/8813136280516059793
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8813136280516059793
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I43394a107a28cab4e4c03becaeb973616f330aad
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/96030
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 a80b43f..732e224 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit a80b43fb5100f72548d3f11cd8737e38563adee1
+Subproject commit 732e2248d40de9e3a1cb5ed963cd4edfce8a6a3c