Move to Go 1.20

[qbarrand]

Use errors.Join instead of multierror.

Fixes #712
Fixes #873

/cc @yevgeny-shnaidman

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qbarrand

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[qbarrand]

Requires openshift/release#45422 to be merged first.

[yevgeny-shnaidman]

lint is failing because of fmt

[openshift-ci]

@qbarrand: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/security	2049978	link	false	/test security

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[yevgeny-shnaidman]

/lgtm