Update pyo3 requirement from 0.18.0 to 0.19.0 in /python

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](PyO3/pyo3@v0.18.0...v0.19.0)

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

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

python/Cargo.toml

@@ -18,4 +18,4 @@ crate-type = ["cdylib"]
 
 [dependencies]
 fat-macho-rs = { package = "fat-macho", version = "0.4.3" }
-pyo3 = { version = "0.18.0", features = ["abi3-py37", "extension-module"] }
+pyo3 = { version = "0.19.0", features = ["abi3-py37", "extension-module"] }