Bump github.com/google/go-containerregistry from 0.7.0 to 0.8.0 (#565)

Bumps [github.com/google/go-containerregistry](https://github.com/google/go-containerregistry) from 0.7.0 to 0.8.0.
- [Release notes](https://github.com/google/go-containerregistry/releases)
- [Changelog](https://github.com/google/go-containerregistry/blob/main/.goreleaser.yml)
- [Commits](google/go-containerregistry@v0.7.0...v0.8.0)

---
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>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

go.mod

@@ -9,15 +9,15 @@ require (
 	github.com/fsnotify/fsnotify v1.5.1
 	github.com/go-training/helloworld v0.0.0-20200225145412-ba5f4379d78b
 	github.com/google/go-cmp v0.5.6
-	github.com/google/go-containerregistry v0.7.0
+	github.com/google/go-containerregistry v0.8.0
 	github.com/mattmoor/dep-notify v0.0.0-20190205035814-a45dec370a17
-	github.com/opencontainers/image-spec v1.0.2-0.20210730191737-8e42a01fb1b7
+	github.com/opencontainers/image-spec v1.0.2-0.20211117181255-693428a734f5
 	github.com/sigstore/cosign v1.3.2-0.20211120003522-90e2dcfe7b92
 	github.com/spf13/cobra v1.3.0
 	github.com/spf13/pflag v1.0.5
 	github.com/spf13/viper v1.10.1
 	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
-	golang.org/x/tools v0.1.8-0.20211015140901-98f6e0395b11
+	golang.org/x/tools v0.1.8
 	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b
 	k8s.io/apimachinery v0.23.1
 	sigs.k8s.io/kind v0.11.1