fix: update renovate rules

[workos-sdk-automation]

Summary

Updates Renovate configuration to reduce noise and improve dependency management:

• Monthly schedule: Runs on the third Tuesday of the month before 12pm UTC
• Conflict-only rebasing: Only rebases PRs when they have conflicts
• Grouped minor/patch with automerge: Minor and patch updates are grouped together and automerged
• Separate major/digest PRs without automerge: Major and digest updates get their own PRs and require manual review

This aligns with the configuration in workos-node#1495.

[greptile-apps]

Greptile Summary

Adds Renovate configuration to automate dependency updates for the Elixir SDK. The configuration schedules updates monthly (third Tuesday before 12pm UTC), groups minor/patch updates for automerge, and separates major/digest updates for manual review. Configuration matches workos-node standards.

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• Configuration-only change that adds a standard Renovate setup aligned with workos-node. No code changes, no security concerns, and follows established patterns.
• No files require special attention

Important Files Changed

Filename	Overview
renovate.json	Adds Renovate configuration with monthly schedule, conflict-only rebasing, and grouped minor/patch automerge

_{Last reviewed commit: 564e8bc}

[greptile-apps]

_{1 file reviewed, no comments}

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