ci(dependabot): init dependabot config

[tsandrini]

Overview

Testing

Dependencies

Screenshots

Checklist

• [ ] I have tested the relevant changes locally.
• [ ] I have checked that nix flake check passes.
• [ ] I have ensured my commits follow the project's commits guidelines.
• [ ] I have checked that the changes follow a linear history.
• [ ] (If applicable) I have commented any relevant parts of my code.
• [ ] (If applicable) I have added appropriate unit/feature tests.
• [ ] (If applicable) I have updated the documentation accordingly (in English).

Additional Notes

Summary by Sourcery

Initialize Dependabot configuration to automate weekly dependency updates for the Cargo package ecosystem.

CI:

• Add initial Dependabot configuration to automate dependency updates for the Cargo package ecosystem on a weekly schedule.

[sourcery-ai[bot]]

Reviewer's Guide by Sourcery

This pull request introduces a new Dependabot configuration file to automate dependency updates for the 'cargo' package ecosystem. The configuration specifies that updates should be checked weekly and that the package manifests are located in the root directory.

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