build(deps): update pyo3 requirement from 0.17 to 0.18 (#127)

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@v0.17.0...v0.18.0)

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

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Author: dependabot[bot]

Cargo.toml

@@ -29,7 +29,7 @@ prost-types = { version = "0.11.0", optional = true }
 async-std = { version = "1", features = ["attributes"] }
 criterion = "0.4"
 http-types = "2"
-pyo3 = "0.17"
+pyo3 = "0.18"
 quickcheck = "1"
 rand = "0.8.4"
 tide = "0.16"