Add dependabot

[lucacome]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Adds dependabot to keep dependencies up to date. Most of the GitHub Actions are out of date and even have warnings in all the runs.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Release note:

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: lucacome
Once this PR has been reviewed and has the lgtm label, please assign lavalamp for approval. For more information see the Kubernetes Code Review Process.

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[k8s-ci-robot]

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