Bump to go 1.20

[mauriciopoppe]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind cleanup

What this PR does / why we need it:
Bump to go 1.20, set dependency management tooling.

Does this PR introduce a user-facing change?:

NONE

/assign @msau42
/cc @marosset

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In response to this:

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind cleanup

What this PR does / why we need it:
Bump to go 1.20, in addition setup vulnerability checks on PRs and dependency management tooling.

Does this PR introduce a user-facing change?:

NONE

/assign @msau42
/cc @marosset

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mauriciopoppe

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[msau42]

/lgtm