chore: Add dependabot config

[jamesnrokt]

Instructions

1. PR target branch should be against development
2. PR title name should follow this format: https://github.com/mParticle/mparticle-workflows/blob/main/.github/workflows/pr-title-check.yml
3. PR branch prefix should follow this format: https://github.com/mParticle/mparticle-workflows/blob/main/.github/workflows/pr-branch-check-name.yml

Summary

• Add dependabot config

Testing Plan

• N/A

Reference Issue (For mParticle employees only. Ignore if you are an outside contributor)

• N/A

[Copilot]

Pull Request Overview

Adds a Dependabot configuration file to schedule weekly updates for GitHub Actions workflows.

• Introduces .github/dependabot.yml
• Sets update interval to weekly, limits open PRs to 4, and applies a dependabot label

[mparticle-automation]

🎉 This PR is included in version 8.36.0 🎉

The release is available on GitHub release

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