chore(t8s-cluster/dependencies): update docker.io/bitnami/kubectl docker tag to v1.29.8

[renovate]

This PR contains the following updates:

Package	Update	Change
docker.io/bitnami/kubectl (source)	patch	1.29.6 -> 1.29.8

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[teutonet-bot]

🤖 I have diffed this beep boop

"/$namespace/$kind/$name.yaml" for normal resources
"/$namespace/HelmRelease/$name/$namespace/$kind/$name.yaml" for HelmReleases <- this is recursive
'null' means it's either cluster-scoped or it's in the default namespace for the HelmRelease

[charts/t8s-cluster/ci/artifacthub-values.yaml]({"errors": [{}]})

[charts/t8s-cluster/ci/cidrs-values.yaml]({"errors": [{}]})

[charts/t8s-cluster/ci/injectedCertificateAuthorities-values.yaml]({"errors": [{}]})

[charts/t8s-cluster/ci/hcp-values.yaml]({"errors": [{}]})

[charts/t8s-cluster/ci/securityGroups-values.yaml]({"errors": [{}]})

charts/t8s-cluster/ci/calico-values.yaml

[charts/t8s-cluster/ci/bastion-values.yaml]({"errors": [{}]})

charts/t8s-cluster/values.yaml

[charts/t8s-cluster/ci/gpu-flavor-values.yaml]({"errors": [{}]})