chore(renovate): tidy preset defaults

[JacobPEvans]

Summary

Remove an unused field from the org-wide Renovate preset. Defaults are sufficient.

Test plan

• renovate-presets.json is valid JSON
• Downstream repos extending this preset continue to evaluate Renovate runs correctly

Assisted-by: Claude noreply@anthropic.com

[gemini-code-assist]

Summary of Changes

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This pull request simplifies the organization's Renovate configuration by removing an unnecessary timezone specification. By leveraging default behaviors, the configuration remains cleaner and easier to maintain without impacting the expected functionality of dependency updates.

Highlights

• Configuration Cleanup: Removed the redundant 'timezone' field from the organization-wide Renovate preset to rely on default settings.

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A setting removed from the list, / A timezone that will not be missed. / The defaults now rule, / A clean coding tool, / With logic that cannot be hissed.

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