[roll third_party/pigweed] pw_tokenizer: Make Rust hashing function const

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/186273

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: d7d4dccfa5a43c9..3e12ae03b72ab8e
Roller-URL: https://ci.chromium.org/b/8759987927782216353
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I121ee576c55c1d74cb24f7e71b40f3246ea855d6
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/186473
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index d7d4dcc..3e12ae0 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit d7d4dccfa5a43c95f4a14e5bfb80b3d7a27a9ba5
+Subproject commit 3e12ae03b72ab8eade72e62d4960152593440856