workhorse: drop support for go 1.16
What does this MR do and why?
GitLab 14.10 has been released. We can drop support for Go 1.16 according to the go version policy: https://docs.gitlab.com/ee/development/go_guide/go_upgrade.html#supporting-multiple-go-versions
Gitlab Version: v15.0.0-ee
CNG version: v15.0.0-ee (go 1.17.6)
Omnibus-builder image revision: 3.3.1 (go 1.17.6)
Gitlab Version: v14.10.0-ee
CNG version: v14.10.0-ee (go 1.17.6)
Omnibus-builder image revision: 3.2.0 (go 1.17.6)
Gitlab Version: v14.9.0-ee
CNG version: v14.9.0-ee (go 1.17.6)
Omnibus-builder image revision: 2.15.0 (go 1.17.6)
See drop go 1.16 support (gitlab-pages!740 - merged)
See drop go 1.16 support (gitlab-shell!601 - merged)
See build: drop go 1.16 support (container-registry!981 - merged)
and many other gitlab projects
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