ci: enable Renovate with auto-merge for Cargo dependencies

[kdkasad]

Uses Renovate to check for updates to Cargo dependencies, auto-merging trivial updates to reduce noise.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.71%. Comparing base (791f438) to head (77d516f).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #88   +/-   ##
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  Coverage   86.71%   86.71%           
=======================================
  Files           8        8           
  Lines        2530     2530           
  Branches     2530     2530           
=======================================
  Hits         2194     2194           
  Misses        294      294           
  Partials       42       42           

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[github-actions]

Test Results

46 tests   46 ✅  2s ⏱️
 1 suites   0 💤
 1 files     0 ❌

Results for commit 77d516f.

[Copilot]

Pull request overview

This PR configures Renovate to automatically manage Cargo dependency updates with intelligent auto-merge rules. It adds timezone settings, assigns reviewers, and establishes a schedule for dependency checks while enabling automatic merging of patch updates to reduce maintenance overhead.

Key Changes:

• Enables Cargo package manager alongside existing GitHub Actions and custom JSONata managers
• Configures auto-merge for patch version updates with CI validation
• Sets up scheduled updates for Friday/Saturday with grouping for minor version updates

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[Copilot]

The cron schedule format appears incorrect. Cron expressions should have 5 fields (minute, hour, day of month, month, day of week), but this has 6 fields with a leading asterisk.

This should likely be either:

• "8-23 * * * 5,6" (if intending to run during hours 8-23 on Friday/Saturday)
• "* 8-23 * * 5,6" is not valid cron syntax

Consider using Renovate's text-based schedule format for better readability:

• "after 8am and before 11pm on friday and saturday"

Suggested change

	"schedule": "* 8-23 * * 5,6"
	"schedule": "after 8am and before 11pm on friday and saturday"