rebase: bump sigs.k8s.io/controller-runtime

Bumps the k8s-dependencies group with 1 update in the / directory: [sigs.k8s.io/controller-runtime](https://github.com/kubernetes-sigs/controller-runtime).

Updates `sigs.k8s.io/controller-runtime` from 0.17.3 to 0.18.2
- [Release notes](https://github.com/kubernetes-sigs/controller-runtime/releases)
- [Changelog](https://github.com/kubernetes-sigs/controller-runtime/blob/main/RELEASE.md)
- [Commits](https://github.com/kubernetes-sigs/controller-runtime/compare/v0.17.3...v0.18.2)

---
updated-dependencies:
- dependency-name: sigs.k8s.io/controller-runtime
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: k8s-dependencies
...

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

vendor/k8s.io/kube-openapi/pkg/builder3/openapi.go

@@ -326,6 +326,9 @@ func BuildOpenAPISpecFromRoutes(webServices []common.RouteContainer, config *com
 	if err != nil {
 		return nil, err
 	}
+	if config.PostProcessSpec != nil {
+		return config.PostProcessSpec(a.spec)
+	}
 	return a.spec, nil
 }
 

vendor/k8s.io/kube-openapi/pkg/common/common.go

@@ -164,6 +164,9 @@ type OpenAPIV3Config struct {
 	// It is an optional function to customize model names.
 	GetDefinitionName func(name string) (string, spec.Extensions)
 
+	// PostProcessSpec runs after the spec is ready to serve. It allows a final modification to the spec before serving.
+	PostProcessSpec func(*spec3.OpenAPI) (*spec3.OpenAPI, error)
+
 	// SecuritySchemes is list of all security schemes for OpenAPI service.
 	SecuritySchemes spec3.SecuritySchemes
 

vendor/k8s.io/kube-openapi/pkg/schemaconv/smd.go

@@ -214,9 +214,6 @@ func makeUnion(extensions map[string]interface{}) (schema.Union, error) {
 		}
 	}
 
-	if union.Discriminator != nil && len(union.Fields) == 0 {
-		return schema.Union{}, fmt.Errorf("discriminator set to %v, but no fields in union", *union.Discriminator)
-	}
 	return union, nil
 }