snap: Use "snapcraftctl set-version"
snap: Use "snapcraftctl set-version"

This allows the use of "git describe --tags" to recognize lightweight
version tags, and the removal of initial "v" in the hugo snap version.

See #10225

gohugoio/hugo,gohugoio/hugo,anthonyfok/hugo,anthonyfok/hugo,gohugoio/hugo,anthonyfok/hugo