Bump k8s.io/api in /test/custom-task-ctrls/wait-task-beta

Bumps [k8s.io/api](https://github.com/kubernetes/api) from 0.26.2 to 0.26.4.
- [Release notes](https://github.com/kubernetes/api/releases)
- [Commits](kubernetes/api@v0.26.2...v0.26.4)

---
updated-dependencies:
- dependency-name: k8s.io/api
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

test/custom-task-ctrls/wait-task-beta/go.mod

@@ -6,8 +6,8 @@ require (
 	github.com/emicklei/go-restful v2.16.0+incompatible // indirect
 	github.com/google/go-cmp v0.5.9
 	github.com/tektoncd/pipeline v0.46.0
-	k8s.io/api v0.26.2
-	k8s.io/apimachinery v0.26.2
+	k8s.io/api v0.26.4
+	k8s.io/apimachinery v0.26.4
 	k8s.io/client-go v0.25.9
 	k8s.io/utils v0.0.0-20221108210102-8e77b1f39fe2
 	knative.dev/pkg v0.0.0-20230221145627-8efb3485adcf