Use NFS server v4.2 in nfs-pv example

[liiri]

We had problems with running the default v4 version, limit on connection pool etc, seems like 4.2 would be a better default

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[liiri]

cla signed

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: idvoretskyi, liiri

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[liiri]

Thanks for your pull request. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

📝 Please follow instructions at https://git.k8s.io/community/CLA.md#the-contributor-license-agreement to sign the CLA.

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I signed it