Provide a vendored tarball

Problem to solve

Build from source in an offline environment

Proposal

It'd be incredibly helpful if the source archives here https://gitlab.com/gitlab-org/cli/-/releases included the vendor directory in them which is produced after running go vendor. See https://go.dev/ref/mod#vendoring

This makes it easy to build glab from source in an offline environment where we can't do the vendoring as it requires network access.

Further details

N/A

Links / references

N/A