Update arrow-flight requirement from 8.0.0 to 56.2.0

Updates the requirements on [arrow-flight](https://github.com/apache/arrow-rs) to permit the latest version.
- [Release notes](https://github.com/apache/arrow-rs/releases)
- [Changelog](https://github.com/apache/arrow-rs/blob/main/CHANGELOG.md)
- [Commits](apache/arrow-rs@8.0.0...56.2.0)

---
updated-dependencies:
- dependency-name: arrow-flight
  dependency-version: 56.2.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

ballista/rust/core/Cargo.toml

@@ -45,7 +45,7 @@ chrono = { version = "0.4", default-features = false }
 clap = { version = "3", features = ["derive", "cargo"] }
 parse_arg = "0.1.3"
 
-arrow-flight = { version = "8.0.0"  }
+arrow-flight = { version = "56.2.0"  }
 datafusion = { path = "../../../datafusion", version = "6.0.0" }
 
 [dev-dependencies]

ballista/rust/executor/Cargo.toml

@@ -30,7 +30,7 @@ snmalloc = ["snmalloc-rs"]
 
 [dependencies]
 arrow = { version = "8.0.0"  }
-arrow-flight = { version = "8.0.0"  }
+arrow-flight = { version = "56.2.0"  }
 anyhow = "1"
 async-trait = "0.1.36"
 ballista-core = { path = "../core", version = "0.6.0" }

datafusion-examples/Cargo.toml

@@ -34,7 +34,7 @@ path = "examples/avro_sql.rs"
 required-features = ["datafusion/avro"]
 
 [dev-dependencies]
-arrow-flight = { version = "8.0.0" }
+arrow-flight = { version = "56.2.0" }
 datafusion = { path = "../datafusion" }
 prost = "0.9"
 tonic = "0.6"