Configure Dependabot version updates for GitHub Actions

[Copilot]

Dependabot version updates were not configured for this repository. The workflow at .github/workflows/validate-plugins.yml uses GitHub Actions that should be kept up-to-date automatically.

Changes

• Added .github/dependabot.yml with github-actions ecosystem configuration
• Weekly update schedule for actions including actions/checkout@v4 and dcarbone/install-jq-action@v2

version: 2
updates:
  - package-ecosystem: "github-actions"
    directory: "/"
    schedule:
      interval: "weekly"

Original prompt

Dependabot version updates aren't configured yet
Dependabot creates pull requests to keep your dependencies up-to-date.

Configure Dependabot version updates for this repository.
see this file https://github.com/ivan-magda/claude-code-plugin-template/blob/main/.github/workflows/validate-plugins.yml

https://docs.github.com/en/code-security/dependabot/dependabot-version-updates

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[Copilot]

Pull request overview

This PR adds Dependabot configuration to automatically manage GitHub Actions version updates for the repository. The configuration enables weekly automated pull requests to keep the GitHub Actions used in the validation workflow up-to-date.

• Adds .github/dependabot.yml with GitHub Actions ecosystem configuration
• Configures weekly update schedule for dependencies
• Targets the workflow at .github/workflows/validate-plugins.yml which uses actions/checkout@v4 and dcarbone/install-jq-action@v2

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