(#266) Updates Version Lookup in ClientSetup Script

[JPRuskin]

Description Of Changes

This commit changes the lookup to something that works on the post-3.71 available calls.

Though the v2-style assumed URL works currently, I have updated it to match the format returned by the index, as I can't speak for if Nexus will remove that.

Motivation and Context

The recent changes to Nexus cause the v2 lookup to no longer work correctly.

Testing

1. Tested against a v3.71 instance of Nexus

Operating Systems Testing

• Windows Server 2022 (Nexus), Windows 11 Sandbox (registering client)

Change Types Made

• [x] Bug fix (non-breaking change).
• ~[ ] Feature / Enhancement (non-breaking change).~
• ~[ ] Breaking change (fix or feature that could cause existing functionality to change).~
• ~[ ] Documentation changes.~
• [x] PowerShell code changes.

Change Checklist

• ~[ ] Requires a change to the documentation.~
• ~[ ] Documentation has been updated.~
• ~[ ] Tests to cover my changes, have been added.~
• ~[ ] All new and existing tests passed?~
• ~[ ] PowerShell code changes: PowerShell v3 compatibility checked?~

Related Issue

Fixes #266