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

Bumps [k8s.io/client-go](https://github.com/kubernetes/client-go) from 0.25.7 to 0.25.8.
- [Release notes](https://github.com/kubernetes/client-go/releases)
- [Changelog](https://github.com/kubernetes/client-go/blob/master/CHANGELOG.md)
- [Commits](kubernetes/client-go@v0.25.7...v0.25.8)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

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

@@ -8,7 +8,7 @@ require (
 	github.com/tektoncd/pipeline v0.46.0
 	k8s.io/api v0.26.2
 	k8s.io/apimachinery v0.26.2
-	k8s.io/client-go v0.25.7
+	k8s.io/client-go v0.25.8
 	k8s.io/utils v0.0.0-20221108210102-8e77b1f39fe2
 	knative.dev/pkg v0.0.0-20230221145627-8efb3485adcf
 )