Update substrait requirement from 0.19.0 to 0.20.0 (#8339)

Updates the requirements on [substrait](https://github.com/substrait-io/substrait-rs) to permit the latest version.
- [Release notes](https://github.com/substrait-io/substrait-rs/releases)
- [Changelog](https://github.com/substrait-io/substrait-rs/blob/main/CHANGELOG.md)
- [Commits](substrait-io/substrait-rs@v0.19.0...v0.20.0)

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

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

Author: dependabot[bot]

datafusion/substrait/Cargo.toml

@@ -35,7 +35,7 @@ itertools = { workspace = true }
 object_store = { workspace = true }
 prost = "0.12"
 prost-types = "0.12"
-substrait = "0.19.0"
+substrait = "0.20.0"
 tokio = "1.17"
 
 [features]