[roll third_party/pigweed] pw_tokenizer: Move encode_args.h header to make it public

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/39983

third_party/pigweed Rolled-Commits: 21ab0f4ec0e6fd8..7c8b339ca254a8a
Roller-URL: https://ci.chromium.org/b/8850658765790133984
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8850658765790133984
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I4de88ab9f29557481e7bcf1d109ab04727962c10
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/40084
Reviewed-by: 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 21ab0f4..7c8b339 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 21ab0f4ec0e6fd82d13187a940b820f57003c469
+Subproject commit 7c8b339ca254a8a56a27d34be7c551bb3ec94e9c