[CHEF-12875] Fetch the test-kitchen from the chef fork

[ashiqueps]

Description

We have forked the test-kitchen/test-kitchen repo to chef/test-kitchen. This PR will fetch the test-kitchen from the fork instead of Rubygems.org.

Dependent PR - chef/chef-test-kitchen-enterprise#1

Related Issue

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.

[netlify]

👷 Deploy Preview for chef-workstation processing.

Name	Link
🔨 Latest commit	e6fceee
🔍 Latest deploy log	https://app.netlify.com/sites/chef-workstation/deploys/66e17accc241170008b6b29a

[sonarqube-for-infrastructure-prod]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarQube

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud