chore(deps): update renovate.json stability and add configMigration

[devin-ai-integration]

chore(deps): update renovate.json stability and add configMigration

Summary

Applied standardized renovate.json configuration rules as part of organization-wide effort to improve dependency management consistency across all matsuri-tech repositories.

Changes made:

• Added :configMigration to extends array to enable automatic migration of deprecated Renovate configuration options
• Increased stabilityDays for minor updates: 3 days → 7 days
• Increased stabilityDays for patch updates: 1 day → 7 days

These changes make dependency updates more conservative by waiting longer before applying updates, reducing the risk of introducing unstable or problematic dependencies.

Review & Testing Checklist for Human

• Verify that 7-day stability periods are appropriate for this repository's dependency update needs (not too slow for security patches)
• Confirm this aligns with the organization-wide renovate standardization effort across matsuri-tech repositories

Notes

This is part of a systematic update being applied to all matsuri-tech repositories to standardize renovate configurations. The changes make dependency updates more conservative while adding future-proofing for renovate configuration migrations.

Link to Devin run: https://app.devin.ai/sessions/60a3d1f0b995416fbd6af9c725d7e4d7
Requested by: @hrdtbs

[devin-ai-integration]

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