chore(deps): bump go to v1.26.5

Description

This MR updates the Go version to 1.26.5 across all three required files, matching the file coverage pattern established by !3397 (merged) (the previous Go version bump).

Changes:

  • .gitlab-ci.yml: GO_VERSION updated from 1.26.41.26.5
  • .tool-versions: golang updated from 1.26.41.26.5
  • go.mod: go directive updated from 1.26.41.26.5

This supersedes !3509 (closed) which was created by Renovate Bot but only updated go.mod, missing the .gitlab-ci.yml and .tool-versions updates. The fork project (gitlab-renovate-forks/cli) does not allow push access via the Duo Agent Platform token, so this MR is created from the gitlab-org/cli project directly.

Supersedes !3509 (closed)

How has this been tested?

The diff has been verified to contain exactly the same three file changes as !3397 (merged) (the previous Go version bump from 1.26.3 → 1.26.4).

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