Upgrade bundled Chocolatey

[mwallner]

Description Of Changes

Upgrades Chocolatey to 2.4.3

Motivation and Context

Boxstarter should include a recent version of Chocolatey

Testing

TODO

Operating Systems Testing

TODO

Change Types Made

• Bug fix (non-breaking change).
• Feature / Enhancement (non-breaking change).
• Breaking change (fix or feature that could cause existing functionality to change).
• Documentation changes.
• 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 #551