Update pyo3 requirement from 0.15 to 0.16

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@v0.15.0...v0.16.0)

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

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

arrow/Cargo.toml

@@ -53,7 +53,7 @@ chrono-tz = {version = "0.6", optional = true}
 flatbuffers = { version = "=2.1.0", optional = true }
 hex = "0.4"
 comfy-table = { version = "5.0", optional = true, default-features = false }
-pyo3 = { version = "0.15", optional = true }
+pyo3 = { version = "0.16", optional = true }
 lexical-core = "^0.8"
 multiversion = "0.6.1"
 bitflags = "1.2.1"