Update request: piper 0.7 → 0.8

[e-tho]

• Package name: piper
• Latest released version: 0.8
• Current version on the unstable channel: 0.7
• Current version on the stable/release channel: 0.7
• [x] Checked the nixpkgs pull requests

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@mvnetbiz

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[myclevorname]

I will tackle this issue, but nixpkgs-review is currently running.