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 Most of the GitHub Actions are out of date and even have warnings in all the runs.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]

Welcome @lucacome!

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[lucacome]

@liggitt what do you think about this?

[liggitt]

I don't really think we need to add it for this repo

• we don't build binaries out of this repository
• we only have two direct dependencies, which are both slow moving and expected to be API stable, so any downstream consumer should be able to use whatever version they want
• this repo has an explicit goal of not picking up any new dependencies: "Very few (ideally zero) external dependencies."

[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all PRs.

This bot triages PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the PR is closed

You can:

• Mark this PR as fresh with /remove-lifecycle stale
• Close this PR with /close
• Offer to help out with Issue Triage

Please send feedback to sig-contributor-experience at kubernetes/community.

/lifecycle stale

[lucacome]

Let me know if I should close the PR, or change it to only update GitHub Actions.
Personally I don't think it hurts to keep everything up to date (even just to get a PR so we know there's an update), but I'm happy to change it.

[k8s-triage-robot]

The Kubernetes project currently lacks enough active contributors to adequately respond to all PRs.

This bot triages PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the PR is closed

You can:

• Mark this PR as fresh with /remove-lifecycle rotten
• Close this PR with /close
• Offer to help out with Issue Triage

Please send feedback to sig-contributor-experience at kubernetes/community.

/lifecycle rotten

[lucacome]

/remove-lifecycle rotten