Update hashlink requirement from 0.8.4 to 0.9.1

Updates the requirements on [hashlink](https://github.com/kyren/hashlink) to permit the latest version.
- [Release notes](https://github.com/kyren/hashlink/releases)
- [Changelog](https://github.com/kyren/hashlink/blob/master/CHANGELOG.md)
- [Commits](kyren/hashlink@v0.8.4...v0.9.1)

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

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

ballista/cache/Cargo.toml

@@ -32,7 +32,7 @@ edition = "2021"
 async-trait = "0.1.64"
 futures = "0.3"
 hashbrown = "0.14"
-hashlink = "0.8.4"
+hashlink = "0.9.1"
 log = "0.4"
 parking_lot = "0.12"
 tokio = { version = "1.25", features = ["macros", "parking_lot", "rt-multi-thread", "sync", "time"] }