Create dependabot.yml

[lvpeschke]

Description

Update GitHub Actions version automatically every Monday.

Other changes

N/A

Tested

Currently the same config as https://github.com/celo-org/infrastructure/blob/master/.github/dependabot.yml.

Related issues

N/A

Backwards compatibility

Creates PRs for all version upgrades, leaving the decision up to human maintainers, same as now.

Documentation

GitHub docs: https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file

[changeset-bot]

⚠️ No Changeset found

Latest commit: 562302d

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.

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