Update dashmap requirement from ^5.5 to ^6.0

Updates the requirements on [dashmap](https://github.com/xacrimon/dashmap) to permit the latest version.
- [Release notes](https://github.com/xacrimon/dashmap/releases)
- [Commits](xacrimon/dashmap@v5.5.0...v6.0.1)

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

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

Cargo.toml

@@ -29,7 +29,7 @@ default = ["futures", "native_tls"]
 version = "^1.5"
 
 [dependencies.dashmap]
-version = "^5.5"
+version = "^6.0"
 
 [dependencies.reqwest]
 version = "^0.12"