build(deps): bump k8s-openapi from 0.25.0 to 0.28.0

Bumps [k8s-openapi](https://github.com/Arnavion/k8s-openapi) from 0.25.0 to 0.28.0.
- [Release notes](https://github.com/Arnavion/k8s-openapi/releases)
- [Changelog](https://github.com/Arnavion/k8s-openapi/blob/master/CHANGELOG.md)
- [Commits](Arnavion/k8s-openapi@v0.25.0...v0.28.0)

---
updated-dependencies:
- dependency-name: k8s-openapi
  dependency-version: 0.28.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Cargo.lock

@@ -36,7 +36,7 @@ git = "https://github.com/linkerd/linkerd-kubert.git"
 tag = "kubert/v0.25.0"
 
 [dependencies.k8s-openapi]
-version = "0.25"
+version = "0.28"
 features = ["v1_33"]
 
 [dependencies.tokio]