Fix bad config property in privacy.md

[ChristianCiach]

Thank you for your interest in contributing! For general guidelines, please refer to
the contributing guide.

Before filing a pull request, make sure to do the following:

• Create a new issue at https://github.com/GoogleContainerTools/jib/issues/new/choose.
• Ensure that your implementation plan is approved by the team.
• Verify that integration tests and unit tests are passing after the change.
• Address all checkstyle issues. Refer to
  the style guide.

This helps to reduce the chance of having a pull request rejected.

Fixes #4029 🛠️

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

The version of Java (11.0.20.1) you have used to run this analysis is deprecated and we will stop accepting it soon. Please update to at least Java 17.
Read more here

[mpeddada1]

Thank you for fixing our documentation!