Try adding dependabot across the repo

[petebacondarwin]

Currently this will not generate the changesets that we usually have for workerd, workers-types and C3 updates.
In the meantime, we could add changesets manually.
If the config looks like it is working we can look into making the tooling more general.

---

• Tests
  • Tests included
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• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: CI change
• Wrangler V3 Backport
  • Wrangler PR:
  • Not necessary because: CI change

[changeset-bot]

⚠️ No Changeset found

Latest commit: 885472e

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[pkg-pr-new]

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wrangler

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commit: 885472e

[Copilot]

Pull Request Overview

This PR adds a new Dependabot configuration to automatically check for npm dependency updates across the repository, excluding workerd and workers-types which are already handled by a separate configuration.

• Adds daily dependency checks for all npm packages except workerd and workers-types
• Configures a 5-day cooldown period between updates (though this option is invalid)
• Uses "increase-if-necessary" versioning strategy to minimize disruption

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[Copilot]

The cooldown configuration option is not a valid Dependabot configuration option. GitHub's Dependabot does not support this field. If you want to limit the frequency of pull requests, consider using open-pull-requests-limit instead to control how many PRs can be open at once.

Suggested change

	cooldown:
	default-days: 5