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]

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[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.