Updating the knife to 18.8.68

[talktovikas]

Description

[Please describe what this change achieves]

Issues Resolved

[List any existing issues this PR resolves, or any Discourse or StackOverflow discussions that are relevant]

Check List

• [ ] New functionality includes tests
• [ ] All buildkite tests pass
• [ ] Full omnibus build and tests in buildkite pass
• [ ] All commits have been signed-off for the Developer Certificate of Origin. See https://github.com/chef/chef/blob/main/CONTRIBUTING.md#developer-certification-of-origin-dco
• [ ] PR title is a worthy inclusion in the CHANGELOG

[netlify[bot]]

👷 Deploy Preview for chef-server processing.

Name	Link
🔨 Latest commit	ae38174b4d70c1570cbf7e1c0525e6b4ae1ace8c
🔍 Latest deploy log	https://app.netlify.com/projects/chef-server/deploys/693ab382a3d09800080e7b8e

[sonarqubecloud[bot]]

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 SonarQube Cloud

[sonarqube-for-infrastructure-prod[bot]]

Quality Gate failed

Failed conditions
1 New issue

See analysis details on SonarQube

Catch issues before they fail your Quality Gate with our IDE extension SonarQube for IDE

[talktovikas]

adhoc https://buildkite.com/chef/chef-chef-server-main-omnibus-adhoc/builds/7995