…bash-3

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Update vendor spf13/cobra to fix completion error in bash 3

**What this PR does / why we need it**: This PR updates vendor spf13/cobra to fix completion error in bash 3.

/ref spf13/cobra#628
/cc @eparis

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes kubernetes/kubectl#121, kubernetes/kubernetes#29322, kubernetes/kubernetes#32676.

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

Kubernetes-commit: 308647b01920f28a2de55d39287ae99ff03ec678