update go version from 1.20 to 1.21

[dgrove-oss]

1. Go 1.22 has been released, meaning go 1.20 is out of support.
2. Kueue and AppWrapper both have go 1.21 as their minimal version.

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign astefanutti for approval. For more information see the Kubernetes Code Review Process.

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

Needs approval from an approver in each of these files:

• OWNERS

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

[ChristianZaccaria]

There are several other instances where we could upgrade go versions too including

codeflare-operator/Dockerfile

Line 2 in bb24607

FROM registry.access.redhat.com/ubi8/go-toolset:1.20.10 as builder

and others, maybe the workflows go version used too.

[dgrove-oss]

I updated the workflow files.

It looks to me like there is no go 1.21 version of ubi8/go-toolset available yet. go-toolset 1.20.12 is the most recent tag I see.

[dgrove-oss]

Closing this. We're going to take a less incremental approach of migrating the code flare operator from MCADv1 to the new Kueue-capable AppWrapper. Will open a new PR when the larger step is ready to review.