Bump go to 1.23.6

[janisz]

Testing in: stackrox/stackrox#14430

[RTann]

Can you update scanner-build, too?

[janisz]

@RTann Done. I was not aware that scanner in stackrox uses different image

[RTann]

Seems good to me, so approving, though @BradLugo would know more about what else would need to happen to make sure we can do this upstream/downstream. Seems like it's available downstream, so I do not believe there are any blockers

[BradLugo]

Other changes that would be nice for upstream: updating stackrox-ui-test.Dockerfile and getting the new images mirrored in OSCI. However, I don't think these are required (they're nice-to-haves, mostly for consistency).

For downstream, I see it's available as well, and our downstream pipelines should get the latest builders, i.e., we shouldn't need to do anything downstream.