bump golang to 1.26.5

Stefan Kahnrequested to merge
skahn-bump-go-1-26-5 into main

⚠️ ️NOTE THAT THIS FORK IS MAINTAINED FOR CRITICAL BUG FIXES AFFECTING RUNNING COSTS ONLY. NO OTHER CONTRIBUTIONS WILL BE ACCEPTED. ⚠️

What critical bug this MR is fixing?

This resolves High-severtity CVES: CVE-2026-27145, CVE-2026-39822, CVE-2026-42504

https://gitlab.com/gitlab-org/ci-cd/docker-machine/-/work_items/156

How does this change help reduce cost of usage? What scale of cost reduction is it?

N/A

In what scenarios is this change usable with GitLab Runner's docker+machine executor?

N/A

closes https://gitlab.com/gitlab-org/ci-cd/docker-machine/-/work_items/156

Edited by Stefan Kahn

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