Bump serde from 1.0.193 to 1.0.196

Bumps [serde](https://github.com/serde-rs/serde) from 1.0.193 to 1.0.196.
- [Release notes](https://github.com/serde-rs/serde/releases)
- [Commits](serde-rs/serde@v1.0.193...v1.0.196)

---
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

@@ -15,7 +15,7 @@ chrono = "0.4.31"
 # https://github.com/sigp/discv5/commit/a9ded0490229418cb61e747d55d3e0879b62e1d7
 discv5 = { git = "https://github.com/sigp/discv5.git", rev = "a9ded0490229418cb61e747d55d3e0879b62e1d7" }
 rand_xorshift = "0.3.0"
-serde = "1.0.193"
+serde = "1.0.196"
 serde_json = "1.0.108"
 testground = "0.4.0"
 tokio = { version = "1.34.0", features = ["macros"] }