Add cooldown configuration to Dependabot with 7-day delay

[wataru86]

What

• Add cooldown configuration to Dependabot with 7-day delay

[gemini-code-assist]

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[Copilot]

Pull Request Overview

Configures Dependabot to add a 7-day cooldown period between dependency update attempts across all package ecosystems (npm, github-actions) to reduce update frequency and potential noise.

• Added cooldown configuration with 7-day default delay to all Dependabot update configurations
• Applied consistently across npm, github-actions, and actions/publish directory configurations

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