chore: update aem-mock to 5.5.0

[Buuhuu]

Updates the aem-mock dependency to aem-mock 5.5.0.

This requires Java 11

Motivation and Context

To address some vulnerabilities in transitive dependencies of the older version.

How Has This Been Tested?

integration tests

Types of changes

• [x] 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)

Checklist:

• [x] I have signed the Adobe Open Source CLA.
• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.