Bump the cargo group with 2 updates

Bumps the cargo group with 2 updates: [serde_json](https://github.com/serde-rs/json) and [tokio](https://github.com/tokio-rs/tokio).


Updates `serde_json` from 1.0.120 to 1.0.121
- [Release notes](https://github.com/serde-rs/json/releases)
- [Commits](serde-rs/json@v1.0.120...v1.0.121)

Updates `tokio` from 1.38.1 to 1.39.2
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](tokio-rs/tokio@tokio-1.38.1...tokio-1.39.2)

---
updated-dependencies:
- dependency-name: serde_json
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: cargo
- dependency-name: tokio
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: cargo
...

Signed-off-by: dependabot[bot] <[email protected]>

Cargo.toml

@@ -9,7 +9,7 @@ edition = "2021"
 axum = "0.7"
 dotenv = "0.15"
 serde = { version = "1.0", features = ["derive"] }
-serde_json = "1.0.120"
+serde_json = "1.0.121"
 tokio = { version = "1", features = ["macros", "rt-multi-thread", "signal"] }
 chrono = "0.4.31"
 wallet-pass = "0.4.0"