build(deps): bump tokenizers from 0.21.2 to 0.21.4

Bumps [tokenizers](https://github.com/huggingface/tokenizers) from 0.21.2 to 0.21.4.
- [Release notes](https://github.com/huggingface/tokenizers/releases)
- [Changelog](https://github.com/huggingface/tokenizers/blob/main/RELEASE.md)
- [Commits](https://github.com/huggingface/tokenizers/compare/v0.21.2...v0.21.4)

---
updated-dependencies:
- dependency-name: tokenizers
  dependency-version: 0.21.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

crates/sbv2_core/Cargo.toml

@@ -25,7 +25,7 @@ serde = { version = "1.0.210", features = ["derive"] }
 serde_json = "1.0.141"
 tar = "0.4.41"
 thiserror = "2.0.11"
-tokenizers = { version = "0.21.2", default-features = false }
+tokenizers = { version = "0.21.4", default-features = false }
 zstd = "0.13.2"
 
 [features]