chore: bump serde from 1.0.203 to 1.0.228

Bumps [serde](https://github.com/serde-rs/serde) from 1.0.203 to 1.0.228.
- [Release notes](https://github.com/serde-rs/serde/releases)
- [Commits](serde-rs/serde@v1.0.203...v1.0.228)

---
updated-dependencies:
- dependency-name: serde
  dependency-version: 1.0.228
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Cargo.lock

@@ -23,7 +23,7 @@ codegen-units=1
 thiserror = "1.0"
 libc = "0.2.155"
 streaming-iterator = "0.1.5"
-serde = {version = "1.0.203", features = ["derive"], optional = true}
+serde = {version = "1.0.228", features = ["derive"], optional = true}
 serde_json = {version = "1.0.120", optional = true}
 bincode = {version = "1.3.1", optional = true}
 tskit-derive = {version = "0.2.0", path = "tskit-derive", optional = true}
@@ -32,7 +32,7 @@ chrono = { version = "0.4.40", default-features = false, features = ["now", "std
 [dev-dependencies]
 anyhow = {version = "1.0.86"}
 clap = {version = "4.4.6", features = ["derive"]}
-serde = {version = "1.0.203", features = ["derive"]}
+serde = {version = "1.0.228", features = ["derive"]}
 serde-pickle = "1.1.0"
 serde_json = {version = "1.0.120"}
 bincode = "1.3.1"