Bump serde_json from 1.0.128 to 1.0.129 in /example

Bumps [serde_json](https://github.com/serde-rs/json) from 1.0.128 to 1.0.129.
- [Release notes](https://github.com/serde-rs/json/releases)
- [Commits](serde-rs/json@1.0.128...1.0.129)

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

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

example/Cargo.toml

@@ -15,7 +15,7 @@ cfg-if = "1.0.0"
 axum = { version = "^0.7.6", default-features = false }
 axum-cloudflare-adapter = { path = "../adapter" }
 oneshot = "0.1.8"
-serde_json = "1.0.128"
+serde_json = "1.0.129"
 tower-service = "0.3.3"
 url = "2.5.2"
 wasm-bindgen-futures = "0.4.43"