Update json_value_merge requirement from 1.1.2 to 2.0.0 in /api

Updates the requirements on [json_value_merge](https://github.com/jmfiaschi/json_value_merge) to permit the latest version.
- [Release notes](https://github.com/jmfiaschi/json_value_merge/releases)
- [Changelog](https://github.com/jmfiaschi/json_value_merge/blob/main/CHANGELOG.md)
- [Commits](jmfiaschi/json_value_merge@v1.1.2...v2.0.0)

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

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

api/Cargo.toml

@@ -7,7 +7,7 @@ edition = "2021"
 
 [dependencies]
 attohttpc = { version = "0.26.0", features = ["basic-auth", "json"] }
-json_value_merge = "1.1.2"
+json_value_merge = "2.0.0"
 regex = "1.7.1"
 serde = { version = "1.0.152", features = ["derive"] }
 serde_json = "1.0.91"