Update project to use Go 1.20

[amisevsk]

What does this PR do?

Update DWO actions/CI to use Go 1.20

What issues does this PR fix or reference?

Follow on from https://github.com/devfile/devworkspace-operator/pull/1206 that got lost when that PR was closed.

Is it tested? How?

N/A

PR Checklist

• [ ] E2E tests pass (when PR is ready, comment /test v8-devworkspace-operator-e2e, v8-che-happy-path to trigger)
  • [ ] v8-devworkspace-operator-e2e: DevWorkspace e2e test
  • [ ] v8-che-happy-path: Happy path for verification integration with Che

[AObuchow]

/retest

[AObuchow]

/retest

[amisevsk]

Depends on https://github.com/devfile/devworkspace-operator/pull/1209 being merged first, then a rebase.

[amisevsk]

/retest

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (9fcb073) 52.89% compared to head (22b927d) 52.89%. Report is 6 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1208 +/- ## ======================================= Coverage 52.89% 52.89% ======================================= Files 84 84 Lines 7595 7595 ======================================= Hits 4017 4017 Misses 3291 3291 Partials 287 287 ```

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[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: amisevsk, AObuchow

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/devfile/devworkspace-operator/blob/main/OWNERS)~~ [amisevsk] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment