chore: add Dependabot configuration for npm and GitHub Actions updates

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Reviewing files that changed from the base of the PR and between 16d8955 and 96bf87b.

📒 Files selected for processing (1)

• .github/dependabot.yml

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[Copilot]

Pull request overview

Adds a Dependabot configuration so the repository automatically receives dependency update PRs for both Node (npm) packages and GitHub Actions workflows.

Changes:

• Introduces .github/dependabot.yml with weekly update checks for npm dependencies at the repo root.
• Enables weekly update checks for GitHub Actions used in .github/workflows.

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