CI: Add dependabot

[cathay4t]

Robot will create PR monthly to update dependencies.

[gemini-code-assist]

Summary of Changes

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This pull request introduces Dependabot to the repository, establishing an automated process for keeping project dependencies up-to-date. This enhancement aims to improve the long-term maintainability and security posture of the codebase by regularly checking for and proposing updates to GitHub Actions and Rust cargo dependencies.

Highlights

• Dependabot Integration: Configured Dependabot to automate dependency updates for both GitHub Actions workflows and Rust projects, ensuring timely security and feature updates.

Changelog

• .github/dependabot.yml
  • Added Dependabot configuration for GitHub Actions and Rust dependencies.

Activity

• No specific activity (comments, reviews, or progress updates) has been recorded for this pull request yet.

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[gemini-code-assist]

Code Review

This pull request introduces a Dependabot configuration to automatically manage dependencies for GitHub Actions and Cargo. The configuration for Cargo specifies an incorrect directory, which will prevent it from functioning correctly. I have provided a suggestion to fix the path.