Bump tiktoken-rs from 0.5.6 to 0.5.7 in /bindings/python (#57)

Bumps [tiktoken-rs](https://github.com/zurawiki/tiktoken-rs) from 0.5.6 to 0.5.7.
- [Release notes](https://github.com/zurawiki/tiktoken-rs/releases)
- [Commits](zurawiki/tiktoken-rs@v0.5.6...v0.5.7)

---
updated-dependencies:
- dependency-name: tiktoken-rs
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

bindings/python/Cargo.toml

@@ -16,7 +16,7 @@ crate-type = ["cdylib"]
 [dependencies]
 pyo3 = { version = "0.20.0", features = ["abi3-py37"] }
 text-splitter = { version = "0.4.4", features = ["tiktoken-rs", "tokenizers"] }
-tiktoken-rs = "0.5.6"
+tiktoken-rs = "0.5.7"
 tokenizers = { version = "0.14.1", default_features = false, features = [
     "onig",
 ] }