[roll third_party/pigweed] pw_trace_tokenized: Fixes ubsan caught bugs

Adjusts TraceQueue::TryPushBack to validate that the data_size
actually fits in the fixed data_size buffer.

Copies a size_t out of a packed struct in order to safely read it
instead of relying on unaligned access being permitted.

Original-Bug: 542
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/68591

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: c2a4cfcafb87b82..94f7910976e8f64
Roller-URL: https://ci.chromium.org/b/8830716779180570705
Cq-Cl-Tag: roller-builder:pigweed-sample-project-roller
Cq-Cl-Tag: roller-bid:8830716779180570705
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I3e8c776e5e5617ac895d6ed4febeb7507e1ae8c3
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/sample_project/+/68668
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 c2a4cfc..94f7910 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit c2a4cfcafb87b825109b81f611fe4c51ae5ef176
+Subproject commit 94f7910976e8f64dbe0a2453b20fe0ea8d836d26