Bump pyo3 from 0.19.2 to 0.20.0 in /bindings/python (#50)

Bumps [pyo3](https://github.com/pyo3/pyo3) from 0.19.2 to 0.20.0.
- [Release notes](https://github.com/pyo3/pyo3/releases)
- [Changelog](https://github.com/PyO3/pyo3/blob/main/CHANGELOG.md)
- [Commits](PyO3/pyo3@v0.19.2...v0.20.0)

---
updated-dependencies:
- dependency-name: pyo3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

bindings/python/Cargo.toml

@@ -14,7 +14,7 @@ name = "semantic_text_splitter"
 crate-type = ["cdylib"]
 
 [dependencies]
-pyo3 = { version = "0.19.2", features = ["abi3-py37"] }
+pyo3 = { version = "0.20.0", features = ["abi3-py37"] }
 text-splitter = { version = "0.4.4", features = ["tiktoken-rs", "tokenizers"] }
 tiktoken-rs = "0.5.4"
 tokenizers = { version = "0.14.1", default_features = false, features = [