chore: update renovate to refresh lockfile 1x a month

[castastrophe]

Description

This update adds monthly lockfile maintenance to Renovate configuration to ensure dependency lockfiles are regularly refreshed. The primary goal is to keep caniusedb and other indirect dependencies up-to-date, even when they're not direct project dependencies.

Motivation and context

Lockfiles can become stale over time, especially for indirect dependencies like caniusedb that are pulled in by other packages. By enabling monthly lockfile maintenance, we ensure that:

• Indirect dependencies are regularly updated to their latest compatible versions
• Security vulnerabilities in transitive dependencies are addressed more promptly
• Build consistency is maintained across different environments
• The project benefits from performance improvements and bug fixes in underlying packages

This change helps maintain the overall health and security of the dependency tree without requiring manual intervention.

Author's checklist

• I have read the CONTRIBUTING and PULL_REQUESTS documents.
• I have reviewed at the Accessibility Practices for this feature, see: Aria Practices
• I have added automated tests to cover my changes.
• I have included a well-written changeset if my change needs to be published.
• I have included updated documentation if my change required it.

Reviewer's checklist

• Includes a Github Issue with appropriate flag or Jira ticket number without a link
• Includes thoughtfully written changeset if changes suggested include patch, minor, or major features
• Automated tests cover all use cases and follow best practices for writing
• Validated on all supported browsers
• All VRTs are approved before the author can update Golden Hash

Manual review test cases

• Verify Renovate configuration is valid

  1. Go to the .github/renovate.json file
  2. Check that the lockFileMaintenance section is properly configured
  3. Expect monthly scheduling to be enabled

• Confirm lockfile maintenance behavior

  1. Wait for the next monthly Renovate run
  2. Check that lockfiles are updated appropriately
  3. Expect caniusedb and other indirect dependencies to be refreshed

[changeset-bot]

⚠️ No Changeset found

Latest commit: 3384b67

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions]

File metrics

Summary

Total size: 1.43 MB^*

🎉 No changes detected in any packages

* Size is the sum of all main files for packages in the library.
* An ASCII character in UTF-8 is 8 bits or 1 byte.

[github-actions]

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PR #4138 has been deployed to Azure Blob Storage: https://spectrumcss.z13.web.core.windows.net/pr-4138/index.html.