velero command without subcommand returns error

[nrb]

What steps did you take and what happened:
Running velero without a subcommand now returns an error.

What did you expect to happen:
velero without a subcommand should return a help message, but no error.

The output of the following commands will help us better understand what's going on:

Anything else you would like to add:
This appears to be from Cobra v0.0.6, specifically https://github.com/spf13/cobra/blob/v0.0.6/command.go#L957. We need to check for this error and not bubble it up.

Environment:

• Velero version (use velero version): v1.5.1

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[zubron]

This was reported as an issue in spf13/cobra#1056 as is fixed in the 0.0.7 release so hopefully it's enough to just upgrade the version we're using.

[nrb]

Forgot to add a fixes string in the PR. This was closed by #2947.