Chore: Add dependabot configuration

[nick-y-ito]

Overview

Introduces dependabot configuration.

Screen Captures

References

• https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file

Notes

• I purposely set the interval to daily to get quick feedback. Once we get used to it, we can set it to either weekly or monthly
• If we receive too many PRs, consider adding groups option

Assignee Checklist:

• [x] The naming convention of the PR title is correct (See the comment at the top of this template)
• [x] The base branch is correct (See: Types of Branches)
• [x] The branch name follows the Branch Naming Conventions
• [x] The correct assignees and reviewers have been designated for this PR
• [x] The coding style follows the Coding Style Guide
• [x] All the related issues are associated with this PR
• [x] All criteria in the associated issues are met (please tick the checkboxes)
• [x] My changes do not generate new warnings or errors (especially in the console)

Reviewer Checklist:

• [x] Double-check the "Assignee Checklist"
• [x] The code follows the generic best practices and our Coding Style Guide
• [x] The code is well-commented and easy to understand
• [x] The UI changes accurately reflect the provided design

[nick-y-ito]

@kanta1207 @ShoeheyOt cc @kotaaaa Could you review this PR when you have a moment, please?

[nick-y-ito]

@kanta1207 Thank you for your review 😊