ci: add dependabot config with increase-if-necessary versioning

[josephfusco]

Adds a Dependabot config with daily npm, composer, and github-actions update schedules, using versioning-strategy: increase-if-necessary so declared dependency ranges aren't rewritten when the new version still satisfies the existing range.

[changeset-bot]

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Latest commit: 2f8b25e

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[github-actions]

📦 Next.js Bundle Analysis for @faustwp/getting-started-example

This analysis was generated by the Next.js Bundle Analysis action. 🤖

This PR introduced no changes to the JavaScript bundle! 🙌

[Copilot]

Pull request overview

Adds a new Dependabot configuration for the faustjs monorepo to automate dependency update PRs across JavaScript, PHP, and GitHub Actions.

Changes:

• Introduces .github/dependabot.yml with daily update schedules for npm, composer, and github-actions.
• Applies versioning-strategy: increase-if-necessary to the npm updater to avoid rewriting declared ranges when not needed.
• Sets per-ecosystem open PR limits to control update volume.

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