Update pyo3 requirement from 0.18.0 to 0.19.0

Updates the requirements on [pyo3](https://github.com/pyo3/pyo3) to permit the latest version.
- [Release notes](https://github.com/pyo3/pyo3/releases)
- [Changelog](https://github.com/PyO3/pyo3/blob/main/CHANGELOG.md)
- [Commits](https://github.com/pyo3/pyo3/compare/v0.18.0...v0.19.0)

---
updated-dependencies:
- dependency-name: pyo3
  dependency-type: direct:production
...

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

instant-segment-py/Cargo.toml

@@ -18,7 +18,7 @@ crate-type = ["cdylib"]
 ahash = "0.8"
 bincode = "1.3.2"
 instant-segment = { version = "0.10", path = "../instant-segment", features = ["with-serde"] }
-pyo3 = { version = "0.18.0", features = ["extension-module"] }
+pyo3 = { version = "0.19.0", features = ["extension-module"] }
 smartstring = "1"
 
 [package.metadata.maturin]