Bump serde from 1.0.215 to 1.0.216

Bumps [serde](https://github.com/serde-rs/serde) from 1.0.215 to 1.0.216.
- [Release notes](https://github.com/serde-rs/serde/releases)
- [Commits](serde-rs/serde@v1.0.215...v1.0.216)

---
updated-dependencies:
- dependency-name: serde
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

nflux/Cargo.toml

@@ -15,7 +15,7 @@ log = { workspace = true }
 tokio = { workspace = true, features = ["macros", "rt", "rt-multi-thread", "net", "signal"] }
 tracing-subscriber = { version = "0.3.18", features = ["json"] }
 tracing = "0.1.40"
-serde = { version = "1.0.210", features = ["derive"] }
+serde = { version = "1.0.216", features = ["derive"] }
 toml = "0.8.19"
 prometheus = "0.13.4"
 axum = "0.7.7"