Bump github.com/google/go-containerregistry (#231)

Bumps [github.com/google/go-containerregistry](https://github.com/google/go-containerregistry) from 0.19.2 to 0.20.0.
- [Release notes](https://github.com/google/go-containerregistry/releases)
- [Changelog](https://github.com/google/go-containerregistry/blob/main/.goreleaser.yml)
- [Commits](google/go-containerregistry@v0.19.2...v0.20.0)

---
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>

examples/oci-image-verification/go.mod

@@ -5,7 +5,7 @@ go 1.21.0
 replace github.com/sigstore/sigstore-go => ../../
 
 require (
-	github.com/google/go-containerregistry v0.19.2
+	github.com/google/go-containerregistry v0.20.0
 	github.com/sigstore/protobuf-specs v0.3.2
 	github.com/sigstore/sigstore v1.8.4
 	github.com/sigstore/sigstore-go v0.1.0

examples/oci-image-verification/go.sum

@@ -146,8 +146,8 @@ github.com/google/certificate-transparency-go v1.2.1 h1:4iW/NwzqOqYEEoCBEFP+jPbB
 github.com/google/certificate-transparency-go v1.2.1/go.mod h1:bvn/ytAccv+I6+DGkqpvSsEdiVGramgaSC6RD3tEmeE=
 github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
-github.com/google/go-containerregistry v0.19.2 h1:TannFKE1QSajsP6hPWb5oJNgKe1IKjHukIKDUmvsV6w=
-github.com/google/go-containerregistry v0.19.2/go.mod h1:YCMFNQeeXeLF+dnhhWkqDItx/JSkH01j1Kis4PsjzFI=
+github.com/google/go-containerregistry v0.20.0 h1:wRqHpOeVh3DnenOrPy9xDOLdnLatiGuuNRVelR2gSbg=
+github.com/google/go-containerregistry v0.20.0/go.mod h1:YCMFNQeeXeLF+dnhhWkqDItx/JSkH01j1Kis4PsjzFI=
 github.com/google/gofuzz v1.2.0 h1:xRy4A+RhZaiKjJ1bPfwQ8sedCA+YS2YcCHW6ec7JMi0=
 github.com/google/gofuzz v1.2.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
 github.com/google/s2a-go v0.1.7 h1:60BLSyTrOV4/haCDW4zb1guZItoSq8foHCXrAnjBo/o=