Add git dependency for scoop

[russbiggs]

Using a scoop bucket requires git to do the git pull when using scoop.

ERROR Git is required for buckets. Run 'scoop install git' and try again.

Instead of requiring using to manually add this dependency we hsould included it in the scoop instructions

It seems like theres a solution built into goreleaser via the depends key e.g.

 depends: ["git", "foo"]

https://goreleaser.com/customization/scoop/?h=scoop