Bump pyo3 from 0.20.2 to 0.20.3 in /src/_bcrypt (#746)

Bumps [pyo3](https://github.com/pyo3/pyo3) from 0.20.2 to 0.20.3.
- [Release notes](https://github.com/pyo3/pyo3/releases)
- [Changelog](https://github.com/PyO3/pyo3/blob/main/CHANGELOG.md)
- [Commits](PyO3/pyo3@v0.20.2...v0.20.3)

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

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

src/_bcrypt/Cargo.toml

@@ -6,7 +6,7 @@ edition = "2018"
 publish = false
 
 [dependencies]
-pyo3 = { version = "0.20.2", features = ["abi3"] }
+pyo3 = { version = "0.20.3", features = ["abi3"] }
 bcrypt = "0.15"
 bcrypt-pbkdf = "0.10.0"
 base64 = "0.21.7"