build(deps): update cargo_metadata requirement in the cargo-crates group

Updates the requirements on [cargo_metadata](https://github.com/oli-obk/cargo_metadata) to permit the latest version.

Updates `cargo_metadata` to 0.20.0
- [Release notes](https://github.com/oli-obk/cargo_metadata/releases)
- [Changelog](https://github.com/oli-obk/cargo_metadata/blob/main/CHANGELOG.md)
- [Commits](https://github.com/oli-obk/cargo_metadata/compare/0.20.0...0.20.0)

---
updated-dependencies:
- dependency-name: cargo_metadata
  dependency-version: 0.20.0
  dependency-type: direct:production
  dependency-group: cargo-crates
...

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

Cargo.toml

@@ -67,7 +67,7 @@ base64 = { version = "0.22.1", default-features = false }
 bindgen = { version = "0.72", default-features = false }
 bitflags = { version = "2.2.1", default-features = false }
 bytes = { version = "1", default-features = false }
-cargo_metadata = { version = "0.20.0", default-features = false }
+cargo_metadata = { version = "0.21.0", default-features = false }
 clap = { version = "4", default-features = false }
 const-assert = { version = "1.0.1", default-features = false }
 dialoguer = { version = "0.11", default-features = false }