Update datafusion-functions requirement from 43 to 44

Updates the requirements on [datafusion-functions](https://github.com/apache/datafusion) to permit the latest version.
- [Changelog](https://github.com/apache/datafusion/blob/main/CHANGELOG.md)
- [Commits](apache/datafusion@43.0.0...44.0.0)

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

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

Cargo.toml

@@ -35,7 +35,7 @@ dashmap = "6"
 datafusion = "43"
 datafusion-common = "43"
 datafusion-expr = "43"
-datafusion-functions = "43"
+datafusion-functions = "44"
 datafusion-functions-aggregate = "43"
 datafusion-optimizer = "43"
 datafusion-physical-expr = "43"