Add Ruby 4 to test matrix

[anakinj]

Description

Adding Ruby 4 to test matrix
Enabled dependabot to update Github action packages.

Checklist

Before the PR can be merged be sure the following are checked:

• There are tests for the fix or feature added/changed
• A description of the changes and a reference to the PR has been added to CHANGELOG.md. More details in the CONTRIBUTING.md

[Copilot]

Pull request overview

This PR aims to add Ruby 4.0 to the CI test matrix and enable Dependabot for GitHub Actions updates. The changes include updating the workflow to run on a weekly schedule, adding Ruby 4.0 to the test matrix, configuring Dependabot, and documenting the change in the CHANGELOG.

• Adds Ruby 4.0 to the test matrix in the GitHub Actions workflow
• Enables Dependabot to automatically update GitHub Actions dependencies on a weekly schedule
• Adds a scheduled cron job to run tests weekly on Fridays at midnight

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
CHANGELOG.md	Documents the addition of Ruby 4.0 testing in CI
.github/workflows/test.yml	Adds Ruby 4.0 to the test matrix and includes a weekly scheduled run
.github/dependabot.yml	Creates new Dependabot configuration for weekly GitHub Actions updates

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