Update multimap requirement from 0.9.1 to 0.10.0

Updates the requirements on [multimap](https://github.com/havarnov/multimap) to permit the latest version.
- [Commits](https://github.com/havarnov/multimap/commits)

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

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

silent/Cargo.toml

@@ -43,7 +43,7 @@ serde_json = "1.0.109"
 uuid = "1.6.1"
 url = "2.5.0"
 serde_urlencoded = "0.7.1"
-multimap = { version = "0.9.1", features = ["serde"] }
+multimap = { version = "0.10.0", features = ["serde"] }
 mime = "0.3.17"
 tempfile = "3.9.0"
 textnonce = "1.0.0"