Implement Dependabot to handle dependencies

[cbasguti]

Dependabot keeps a watchful eye on project dependencies and generates pull requests (PRs) automatically to ensure they are up to date.

This pull request introduces a dependabot.yml configuration file. I initially crafted a simple version to perform weekly checks using GitHub Actions, but it can be easily adjusted to weekly or monthly intervals as required. Additional settings such as the maximum number of PRs the bot can initiate can also be customized.

For further details, please refer to this source.