Update datafusion requirement in the datafusion-dependencies group

Updates the requirements on [datafusion](https://github.com/apache/datafusion) to permit the latest version.

Updates `datafusion` to 40.0.0
- [Changelog](https://github.com/apache/datafusion/blob/main/CHANGELOG.md)
- [Commits](apache/datafusion@39.0.0...40.0.0)

---
updated-dependencies:
- dependency-name: datafusion
  dependency-type: direct:production
  dependency-group: datafusion-dependencies
...

Signed-off-by: dependabot[bot] <[email protected]>

Cargo.toml

@@ -14,7 +14,7 @@ random-string = "1.0"
 once_cell = "1.19"
 
 tokio = { version = "^1.36", features = ["rt-multi-thread"] }
-datafusion = { version = "39.0", features = ["pyarrow"] }
+datafusion = { version = "40.0", features = ["pyarrow"] }
 async-trait = { version = "0.1" }
 
 [dev-dependencies]