Bump the cargo-dependencies group with 3 updates

Bumps the cargo-dependencies group with 3 updates: [metrics-exporter-prometheus](https://github.com/metrics-rs/metrics), [serde](https://github.com/serde-rs/serde) and [tokio](https://github.com/tokio-rs/tokio).


Updates `metrics-exporter-prometheus` from 0.15.1 to 0.15.3
- [Changelog](https://github.com/metrics-rs/metrics/blob/main/release.toml)
- [Commits](metrics-rs/metrics@metrics-exporter-prometheus-v0.15.1...metrics-exporter-prometheus-v0.15.3)

Updates `serde` from 1.0.203 to 1.0.204
- [Release notes](https://github.com/serde-rs/serde/releases)
- [Commits](serde-rs/serde@v1.0.203...v1.0.204)

Updates `tokio` from 1.38.0 to 1.39.2
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](tokio-rs/tokio@tokio-1.38.0...tokio-1.39.2)

---
updated-dependencies:
- dependency-name: metrics-exporter-prometheus
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: cargo-dependencies
- dependency-name: serde
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: cargo-dependencies
- dependency-name: tokio
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: cargo-dependencies
...

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

Cargo.toml

@@ -8,10 +8,10 @@ anyhow = "1.0.86"
 axum = { version = "0.7.5", features = ["macros"] }
 clap = { version = "~4.4.18", features = ["derive", "env"] }
 metrics = "0.23.0"
-metrics-exporter-prometheus = { version = "0.15.1", default-features = false, features = ["http-listener"] }
+metrics-exporter-prometheus = { version = "0.15.3", default-features = false, features = ["http-listener"] }
 rand = "0.8.5"
 reqwest = { version = "0.12.5", default-features = false, features = ["rustls-tls", "json"] }
-serde = { version = "1.0.203", features = ["derive"] }
-tokio = { version = "1.38.0", features = ["macros", "rt-multi-thread", "signal"] }
+serde = { version = "1.0.204", features = ["derive"] }
+tokio = { version = "1.39.2", features = ["macros", "rt-multi-thread", "signal"] }
 tracing = "0.1.40"
 tracing-subscriber = "0.3.18"