Bump github.com/google/go-containerregistry (#79)

Bumps [github.com/google/go-containerregistry](https://github.com/google/go-containerregistry) from 0.17.0 to 0.18.0.
- [Release notes](https://github.com/google/go-containerregistry/releases)
- [Changelog](https://github.com/google/go-containerregistry/blob/main/.goreleaser.yml)
- [Commits](google/go-containerregistry@v0.17.0...v0.18.0)

---
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

@@ -3,7 +3,7 @@ module github.com/sigstore/sigstore-go/examples/oci-image-verification
 go 1.21
 
 require (
-	github.com/google/go-containerregistry v0.17.0
+	github.com/google/go-containerregistry v0.18.0
 	github.com/sigstore/protobuf-specs v0.2.1
 	github.com/sigstore/sigstore v1.8.1
 	github.com/sigstore/sigstore-go v0.0.0-20240103204255-44c7c85ab358

examples/oci-image-verification/go.sum

@@ -248,8 +248,8 @@ github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
 github.com/google/go-cmp v0.5.4/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 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 v0.17.0 h1:5p+zYs/R4VGHkhyvgWurWrpJ2hW4Vv9fQI+GzdcwXLk=
-github.com/google/go-containerregistry v0.17.0/go.mod h1:u0qB2l7mvtWVR5kNcbFIhFY1hLbf8eeGapA+vbFDCtQ=
+github.com/google/go-containerregistry v0.18.0 h1:ShE7erKNPqRh5ue6Z9DUOlk04WsnFWPO6YGr3OxnfoQ=
+github.com/google/go-containerregistry v0.18.0/go.mod h1:u0qB2l7mvtWVR5kNcbFIhFY1hLbf8eeGapA+vbFDCtQ=
 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/martian v2.1.0+incompatible/go.mod h1:9I4somxYTbIHy5NJKHRl3wXiIaQGbYVAs8BPL6v8lEs=