Bump k8s-openapi from 0.20.0 to 0.21.0

Bumps [k8s-openapi](https://github.com/Arnavion/k8s-openapi) from 0.20.0 to 0.21.0.
- [Release notes](https://github.com/Arnavion/k8s-openapi/releases)
- [Changelog](https://github.com/Arnavion/k8s-openapi/blob/master/CHANGELOG.md)
- [Commits](Arnavion/k8s-openapi@v0.20.0...v0.21.0)

---
updated-dependencies:
- dependency-name: k8s-openapi
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Cargo.toml

@@ -11,7 +11,7 @@ axum = "0.7.4"
 clap = { version = "4.4.18", features = ["derive", "env"] }
 ctrlc = { version = "3.4.2", features = ["termination"] }
 futures = "0.3.30"
-k8s-openapi = { version = "0.20.0", features = ["latest"] }
+k8s-openapi = { version = "0.21.0", features = ["latest"] }
 kube = { version = "0.87.2", features = ["runtime", "derive"] }
 lazy_static = "1.4.0"
 log = "0.4.20"