build(deps): bump github.com/docker/buildx from 0.6.2 to 0.8.0

Bumps [github.com/docker/buildx](https://github.com/docker/buildx) from 0.6.2 to 0.8.0.
- [Release notes](https://github.com/docker/buildx/releases)
- [Commits](https://github.com/docker/buildx/compare/v0.6.2...v0.8.0)

---
updated-dependencies:
- dependency-name: github.com/docker/buildx
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

go.mod

@@ -8,13 +8,14 @@ require (
 	github.com/Microsoft/go-winio v0.5.2
 	github.com/containerd/console v1.0.3
 	github.com/containerd/containerd v1.6.1
-	github.com/docker/buildx v0.6.2
+	github.com/docker/buildx v0.8.0
 	github.com/docker/distribution v2.8.1+incompatible
 	github.com/emicklei/proto v1.9.0 // indirect
 	github.com/go-git/go-git/v5 v5.4.2
 	github.com/gofrs/flock v0.8.1
 	github.com/google/uuid v1.3.0
 	github.com/hashicorp/go-version v1.4.0
+	github.com/lib/pq v1.10.0 // indirect
 	github.com/mattn/go-colorable v0.1.12
 	github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db
 	github.com/mitchellh/go-homedir v1.1.0