Bump serde from 1.0.206 to 1.0.208

Bumps [serde](https://github.com/serde-rs/serde) from 1.0.206 to 1.0.208.
- [Release notes](https://github.com/serde-rs/serde/releases)
- [Commits](serde-rs/serde@v1.0.206...v1.0.208)

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

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

Cargo.toml

@@ -12,7 +12,7 @@ shuttle-runtime = "0.47.0"
 shuttle-serenity = "0.47.0"
 tracing = "0.1.37"
 tokio = "1.39.3"
-serde = { version = "1.0.206", features = ["derive"] }
+serde = { version = "1.0.208", features = ["derive"] }
 shuttle-persist-msgpack = { version = "0.47.0", path = "shuttle-persist-msgpack" }
 rand = "0.8.5"
 chrono = "0.4.38"