chore: Add go toolchain

[svghadi]

What type of PR is this?
Konflux fails to build with error during prefetch stage

2025-07-28 04:11:36,803 ERROR The command "go env GOWORK" failed
2025-07-28 04:11:36,803 ERROR STDERR:
go: downloading go1.23 (linux/amd64)
go: download go1.23 for linux/amd64: toolchain not available
2025-07-28 04:11:36,809 ERROR PackageManagerError: Go execution failed: `go env GOWORK` failed with rc=1
Error: PackageManagerError: Go execution failed: `go env GOWORK` failed with rc=1
  The cause of the failure could be:
  - something is broken in Cachi2
  - something is wrong with your repository
  - communication with an external service failed (please try again)
  The output of the failing command should provide more details, please check the logs.
step-use-trusted-artifact :-

What does this PR do / why we need it:

Have you updated the necessary documentation?

• Documentation update is required by this PR.
• Documentation has been updated.

Which issue(s) this PR fixes:

Fixes #?

How to test changes / Special notes to the reviewer:

[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 wtam2018 for approval. For more information see the 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

[svghadi]

This is a small update to go mod to add toolchain directive, no dependency updates are made. Force merging this bypassing the rules in interest of time. Will revert if something breaks.