Pin versions if using Renovate - No action required

[Copilot]

After comprehensive exploration of the repository, no Renovate configuration files were found. The issue requirements specify:

If Renovate isn't already used for dependency updates (no renovate json file found), do nothing.

Search performed:

• ✅ Checked root directory for renovate.json, .renovaterc, renovate.json5
• ✅ Searched .github directory for Renovate configurations
• ✅ Performed repository-wide search for files containing "renovate" or "config:recommended"
• ✅ Found no existing Renovate configuration

Since this repository does not currently use Renovate for dependency updates, no changes are needed per the issue requirements.

Fixes #28.

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