chore: add dependabot for weekly dependency updates

[shikhar]

Summary

• Adds Dependabot configuration for Cargo dependencies
• Weekly schedule with all dependencies grouped into single PR

🤖 Generated with Claude Code

[greptile-apps]

Greptile Overview

Greptile Summary

Adds Dependabot configuration to automate Cargo dependency updates on a weekly schedule. All dependencies are grouped into a single pull request to reduce maintenance overhead.

• Configuration follows Dependabot v2 schema correctly
• Weekly schedule appropriate for dependency updates
• Grouping strategy reduces PR noise by combining all updates
• Properly targets the root Cargo.toml directory

Confidence Score: 5/5

• This PR is safe to merge with no risk
• The Dependabot configuration is minimal, well-formed, and follows best practices. It's a standard YAML configuration file with no executable code, proper syntax, and appropriate settings for a Rust project. The grouping strategy is sensible for reducing PR overhead.
• No files require special attention

Important Files Changed

Filename	Overview
.github/dependabot.yml	Adds Dependabot configuration for automated weekly Cargo dependency updates with all dependencies grouped

Sequence Diagram

sequenceDiagram
    participant Dependabot
    participant GitHub
    participant Repository
    participant CI/CD
    
    Note over Dependabot: Weekly schedule triggers
    Dependabot->>Repository: Scan Cargo.toml for outdated dependencies
    Repository-->>Dependabot: Return dependency list
    Dependabot->>Dependabot: Group all dependencies into single update
    Dependabot->>GitHub: Create Pull Request with grouped updates
    GitHub->>CI/CD: Trigger CI workflows (ci.yml)
    CI/CD-->>GitHub: Return test results
    Note over GitHub: PR ready for review and merge

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