devel/py-proxmoxer: Update version 1.2.0=>1.3.1

• Pass MAINTAINERSHIP to submitter

In addition to that:

• Mark NO_ARCH
• Change to USE_PYTHON=nose framework
• Disable do-test as release artifact do not provide tests directory

PR: 267850
Reported by: einar@isnic.is
Relnotes: https://github.com/proxmoxer/proxmoxer/releases/tag/1.3.1