chore: migrate Renovate preset to recommended

[alceops]

Summary

• replaces the deprecated Renovate config:base preset with config:recommended
• keeps the existing prConcurrentLimit setting unchanged

Verification

• python3 -m json.tool .github/renovate.json
• git diff --check

I did not run the Terraform/Terratest suite because this repository's guidelines note atmos test run deploys real AWS resources and may incur AWS cost.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 9e636b39-98e1-47a0-9a77-d526d2f410d8

📥 Commits

Reviewing files that changed from the base of the PR and between 885d062 and a9ad5e2.

📒 Files selected for processing (1)

• .github/renovate.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[mergify]

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Cloud Posse Engineering Team Review Required

This pull request modifies files that require Cloud Posse's review. Please be patient, and a core maintainer will review your changes.

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