build(deps): update polars-io requirement from 0.46 to 0.51

Updates the requirements on [polars-io](https://github.com/pola-rs/polars) to permit the latest version.
- [Release notes](https://github.com/pola-rs/polars/releases)
- [Commits](pola-rs/polars@rs-0.46.0...rs-0.51.0)

---
updated-dependencies:
- dependency-name: polars-io
  dependency-version: 0.51.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

ggetrs-string/Cargo.toml

@@ -17,7 +17,7 @@ clap = { workspace = true }
 reqwest = { workspace = true }
 serde_json = { workspace = true }
 polars-core = { version = "0.46", default-features = false }
-polars-io = { version = "0.46", default-features = false, features = [
+polars-io = { version = "0.51", default-features = false, features = [
     "json",
     "csv",
 ] }