🌱 Upgrade golang version (1.18.3 -> 1.19.0)

[oscr]

What this PR does / why we need it:

Upgrade golang version 1.18.3 -> 1.19.0 as required by v1.25.0.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Part of #6661

[sbueringer]

@oscr Can you please also update the go version in v.12-to-v1.3.md?

(I'll re-run the presubmits once the last finding on the test-infra PR is fixed and the test-infra PR is merged)

[oscr]

@sbueringer Done. I didn't bump go.mod since it's still on 1.17. Do want it upgraded?

[sbueringer]

@sbueringer Done. I didn't bump go.mod since it's still on 1.17. Do want it upgraded?

I think it's fine when we bump it when we actually bump our Go dependencies in #7123 (or as a follow-up to that one)

[sbueringer]

/retest

[sbueringer]

/lgtm

Looks like the jobs are working now

[fabriziopandini]

Great Job!
/lgtm
/test pull-cluster-api-e2e-full-main

for a last check

[sbueringer]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [sbueringer]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment