Bump serde from 1.0.203 to 1.0.209

Bumps [serde](https://github.com/serde-rs/serde) from 1.0.203 to 1.0.209.
- [Release notes](https://github.com/serde-rs/serde/releases)
- [Commits](serde-rs/serde@v1.0.203...v1.0.209)

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

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

Author: dependabot[bot]

Cargo.lock

@@ -11,7 +11,7 @@ debug = true
 fastly = "0.10.1"
 hmac-sha256 = "1.1.7"
 rand = "0.8.5"
-serde = { version = "1.0.203", features = ["derive"] }
+serde = { version = "1.0.209", features = ["derive"] }
 serde_json = "1.0.120"
 base64 = "0.22.1"
 jwt-simple = "0.12.9"