[roll third_party/pigweed] pw_bytes/byte_builder: remove stale comment

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/58120

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 0f6099ff8dfd886..43f24395b10fe45
Roller-URL: https://ci.chromium.org/b/8837996144313902833
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8837996144313902833
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I412fd6b50d31f5e7930c59a0d35bca3c5da2000d
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/58084
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 0f6099f..43f2439 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 0f6099ff8dfd886461fc8c9f0738f18cb4df61c9
+Subproject commit 43f24395b10fe456a8f0cddece3bf9ead9f91b06