buildkite: update Go

#6322 tried to update Go to 1.16, but existing nodes fail to upgrade due to the
presence of old Go [1]. Specifically when trying to add Go to `/usr/bin`:

```
ln: failed to create symbolic link '/usr/bin/go': File exists
```

Also:
- Removing `golang-go` also removes apt installs of `gcc` and `pkg-config`, so
  those are installed explicitly.
- Add `-c` to wget, which will prevent re-downloading Go for each run.
- Disable GO111MODULE when building cri-tools and containerd, since we're using
  pre-module versions of each.

1 - https://buildkite.com/gvisor/pipeline/builds/7285#3593244c-e411-472d-804a-9c7fbbd24762

PiperOrigin-RevId: 386106881

0 files changed, 0 insertions, 0 deletions