Bump github.com/google/go-containerregistry from 0.5.1 to 0.6.0

Bumps [github.com/google/go-containerregistry](https://github.com/google/go-containerregistry) from 0.5.1 to 0.6.0.
- [Release notes](https://github.com/google/go-containerregistry/releases)
- [Changelog](https://github.com/google/go-containerregistry/blob/main/.goreleaser.yml)
- [Commits](google/go-containerregistry@v0.5.1...v0.6.0)

---
updated-dependencies:
- dependency-name: github.com/google/go-containerregistry
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

go.mod

@@ -5,7 +5,7 @@ go 1.16
 require (
 	github.com/Masterminds/semver/v3 v3.1.1
 	github.com/docker/distribution v2.7.1+incompatible
-	github.com/google/go-containerregistry v0.5.1
+	github.com/google/go-containerregistry v0.6.0
 	github.com/onsi/gomega v1.15.0
 	github.com/paketo-buildpacks/packit v0.14.3
 	github.com/pelletier/go-toml v1.9.3