Add dependabot

[lucacome]

What this PR does / why we need it:

Adds dependabot to keep dependencies up to date

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

Release note:

NONE

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[k8s-ci-robot]

Welcome @lucacome!

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[dgrisonnet]

/triage accepted
/assign @mengjiao-liu

[mengjiao-liu]

Add it to my to-do list.

[mengjiao-liu]

You may be more familiar with the dependabot configuration. Please double-check it. @pohly

[mengjiao-liu]

Suggested change

	interval: daily
	interval: "weekly"

Does the scheduling interval need to be set to daily? Is it too frequent? I think a weekly run is enough.

[lucacome]

I don't think it makes much of a difference, with weekly it's more likely that you'll get a bunch of PRs all at once and reach the limit of open PRs