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](https://github.com/google/go-containerregistry/compare/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

@@ -3,19 +3,14 @@ module github.com/imjasonh/kontain.me
 go 1.15
 
 require (
-	cloud.google.com/go v0.82.0
+	cloud.google.com/go v0.83.0
 	cloud.google.com/go/storage v1.15.0
-	github.com/containerd/stargz-snapshotter/estargz v0.4.1 // indirect
-	github.com/docker/cli v20.10.2+incompatible // indirect
-	github.com/docker/docker v20.10.2+incompatible // indirect
 	github.com/dustin/go-humanize v1.0.0
-	github.com/google/go-containerregistry v0.5.1
+	github.com/google/go-containerregistry v0.6.0
 	github.com/google/go-github/v32 v32.1.0
 	github.com/google/ko v0.8.3
 	github.com/imjasonh/delay v0.0.0-20210102151318-8339250e8458
-	github.com/sirupsen/logrus v1.7.0 // indirect
 	github.com/tmc/dot v0.0.0-20180926222610-6d252d5ff882
-	golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad // indirect
 	golang.org/x/oauth2 v0.0.0-20210514164344-f6687ab2804c
 	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
 	google.golang.org/api v0.47.0