Update goss serverspec tool to current version

[mboersma]

Is your feature request related to a problem? Please describe.

image-builder uses the goss tool to validate image configurations before considering a build successful.

But currently goss is pinned to an old version and sourced from a deprecated URL.

image-builder/images/capi/scripts/ci-goss-populate.sh

Lines 31 to 32 in 5e7ed38

	_version="v0.3.16"
	_bin_url="https://github.com/aelsabbahy/goss/releases/download/${_version}/goss-linux-amd64"

The old version is also referenced here:

image-builder/images/capi/packer/config/goss-args.json

Line 16 in 5e7ed38

"goss_version": "0.3.16"

and here:

image-builder/docs/book/src/capi/goss/goss.md

Line 41 in 5e7ed38

"goss_version": "0.3.16"

Describe the solution you'd like

The URL and version should be updated to something currently supported and patched.

---

/kind feature
/area dependency

[mboersma]

/help
/good-first-issue

[k8s-ci-robot]

@mboersma:
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[jongwooo]

/assign