CHEF-3450 Replace downloads link

[gdubicki]

Description

Like https://github.com/chef/chef-workstation/pull/3138, there's one more location to update download link. The current one leads to HTTP 404.

Related Issue

chefio.atlassian.net/browse/CHEF-3471, I guess

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Chore (non-breaking change that does not add functionality or fix an issue)

Checklist:

• [ ] I have read the CONTRIBUTING document.
• [ ] I have run the pre-merge tests locally and they pass.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [ ] If Gemfile.lock has changed, I have used --conservative to do it and included the full output in the Description above.
• [ ] All new and existing tests passed.
• [ ] All commits have been signed-off for the Developer Certificate of Origin.