docs: move ttshivers to Emeritus

[MikeMcC399]

Refs: #2506

Description

ttshivers is moved from:

• Collaborators

to

• Emeritus

Many thanks to @ttshivers on behalf of the current team for your valuable previous contributions!

Motivation and Context

During a reorganization related to the Governance change from Docker Working Group to "open maintainer model" in February 2026, ttshivers was added to the published list of Collaborators.

ttshivers was last active in this repo in Oct 2020.

Testing Details

N/A

Types of changes

• Documentation
• Version change (Update, remove or add more Node.js versions)
• Variant change (Update, remove or add more variants, or versions of variants)
• 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)
• Other (none of the above)

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING.md document.
• All new and existing tests passed.

[MikeMcC399]

According to the GOVERNANCE model, this issue should remain open for minimum 5 days to allow feedback.