Add Dependabot Configuration for Automated Dependency Management

[bradjohnl]

Creating dependabot config to enable automated PRs for dependency upgrades, boosting security and maintainability.

What does this PR fix/introduce?

This PR introduces a Dependabot configuration file to the repository. This configuration enables automated pull requests for dependency updates, ensuring our dependencies are up-to-date, secure, and maintained efficiently.

Closes #

Additional context

This change will streamline the process of keeping dependencies updated, reducing the manual effort required and helping to avoid potential security vulnerabilities associated with outdated packages.

Checklist

• Docs are successfully building - yarn install && yarn run build.
• For new internal links I used relative file paths (with .md extension) - e.g. ../../faq/faq-general.md.
• All external links have been verified with yarn run check:externals.
• My changes follow the Casper docs style guidelines.
• All technical procedures have been tested.
• If structural changes are introduced, cross-browser testing has been completed.

Reviewers

@ACStoneCL, @ipopescu

[github-actions]

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