[roll third_party/pigweed] pw_tokenizer: Recursive tokenized proto message

Improves recursive detokenization support for optionally tokenized proto
fields. Previously, binary-encoded tokens with embedded base64 tokens
would not properly recursively decode.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/78564

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 3409f09d2c1f16a..515a5b2edb1cd3f
Roller-URL: https://ci.chromium.org/b/8825116367064535745
Cq-Cl-Tag: roller-builder:pigweed-sample-project-roller
Cq-Cl-Tag: roller-bid:8825116367064535745
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ifd8a20159dee0b9134fc491eee0bc6c0bfc97a2b
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/sample_project/+/78641
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 3409f09..515a5b2 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 3409f09d2c1f16a30fc3489cd387b4f3101d11d9
+Subproject commit 515a5b2edb1cd3f56bf30a8ad165f09042c3e38a