Infra: Implement dependabot dependency cooldown

[Haarolean]

Docs: https://docs.github.com/en/code-security/dependabot/working-with-dependabot/dependabot-options-reference#cooldown-

• For all types of dependencies. Maybe longer for frontend ones, as NPM is more susceptible to supply chain attacks
• Security patches will be raise as a separate PR by dependabot anyway, so no need to worry about it