chore(deps): update which requirement from 6 to 7

Updates the requirements on [which](https://github.com/harryfei/which-rs) to permit the latest version.
- [Release notes](https://github.com/harryfei/which-rs/releases)
- [Changelog](https://github.com/harryfei/which-rs/blob/master/CHANGELOG.md)
- [Commits](harryfei/which-rs@6.0.0...7.0.0)

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

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

crates/hdfs/Cargo.toml

@@ -23,7 +23,7 @@ url = { workspace = true }
 [dev-dependencies]
 serial_test = "3"
 deltalake-test = { path = "../test" }
-which = "6"
+which = "7"
 
 [features]
 integration_test = ["hdfs-native-object-store/integration-test"]