[roll third_party/pigweed] pw_protobuf: Fully quality encoder class names

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/56544

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: f2effc952a10001..38ef479133f0e9d
Roller-URL: https://ci.chromium.org/b/8839347969287162705
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8839347969287162705
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ie1f622f89c44a34dde4bd40633445bbec490afab
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/56545
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 f2effc9..38ef479 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit f2effc952a10001eeb09abb4dbe41bd231b7aee7
+Subproject commit 38ef479133f0e9de3eb35e2abe8fb5bc45d48264