chore(deps): update tokenizers requirement from 0.19.1 to 0.20.1

Updates the requirements on [tokenizers](https://github.com/huggingface/tokenizers) to permit the latest version.
- [Release notes](https://github.com/huggingface/tokenizers/releases)
- [Changelog](https://github.com/huggingface/tokenizers/blob/main/RELEASE.md)
- [Commits](huggingface/tokenizers@v0.19.1...v0.20.1)

---
updated-dependencies:
- dependency-name: tokenizers
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Cargo.toml

@@ -26,7 +26,7 @@ rand = { version = "0.8.5", optional = true }
 [dev-dependencies]
 criterion = "0.5.1"
 rand = "0.8.5"
-tokenizers = "0.19.1"
+tokenizers = "0.20.1"
 
 [[bench]]
 name = "tokenize"