Update dashmap requirement from 5 to 6 (#322)

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@v5.0.0...v6.0.1)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.toml

@@ -23,7 +23,7 @@ async-trait = "0.1.21"
 base64 = "0.22"
 base64-serde = "0.7"
 bytes = "1"
-dashmap = "5"
+dashmap = "6"
 futures = "0.3.1"
 hex = "0.4"
 ironcore-search-helpers = { version = "0.2", optional = true }