Update parquet requirement from 49 to 50

Updates the requirements on [parquet](https://github.com/apache/arrow-rs) to permit the latest version.
- [Changelog](https://github.com/apache/arrow-rs/blob/master/CHANGELOG.md)
- [Commits](apache/arrow-rs@49.0.0...50.0.0)

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

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

deep_causality/examples/ctx/Cargo.toml

@@ -14,7 +14,7 @@ deep_causality = "0.6.2"
 # chrono default-features = false mitigates "RUSTSEC-2020-0071".
 # See https://rustsec.org/advisories/RUSTSEC-2020-0071.html
 chrono = { version = "0.4", default-features = false , features = ["serde", "clock"] }
-parquet = "49"
+parquet = "50"
 petgraph = "0.6"
 # default-features = false mitigates a warning of a yanked sub-sub dependency
 rust_decimal = { version = "1.32", default-features = false, features = ["serde"] }