[roll third_party/pigweed] pw_tokenizer: Variable length hash

Renames pw_tokenizer_65599_fixed_length_hash to pw_tokenizer_65599_hash
and changes the function to do variable length tokenization by default.
This makes it easier to generate unbounded length tokens in addition to
fixed-length tokens.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/78881

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 49f21314ece3a23..36a1ef7322c44fc
Roller-URL: https://ci.chromium.org/b/8825016198469751057
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8825016198469751057
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I1d0be195ca622d9288f11779499b53a32256951b
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/78589
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 49f2131..36a1ef7 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 49f21314ece3a2346fb5adf773ce123221e2712a
+Subproject commit 36a1ef7322c44fc5a9566783674a435a49897abf