Bump github.com/opencontainers/image-spec from 1.1.0-rc4 to 1.1.0-rc5

Bumps [github.com/opencontainers/image-spec](https://github.com/opencontainers/image-spec) from 1.1.0-rc4 to 1.1.0-rc5.
- [Release notes](https://github.com/opencontainers/image-spec/releases)
- [Changelog](https://github.com/opencontainers/image-spec/blob/main/RELEASES.md)
- [Commits](opencontainers/image-spec@v1.1.0-rc4...v1.1.0-rc5)

---
updated-dependencies:
- dependency-name: github.com/opencontainers/image-spec
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

go.mod

@@ -16,7 +16,7 @@ require (
 	github.com/hashicorp/golang-lru v1.0.2
 	github.com/jenkins-x/go-scm v1.14.14
 	github.com/mitchellh/go-homedir v1.1.0
-	github.com/opencontainers/image-spec v1.1.0-rc4
+	github.com/opencontainers/image-spec v1.1.0-rc5
 	github.com/pkg/errors v0.9.1
 	github.com/sigstore/sigstore v1.7.3
 	github.com/spiffe/go-spiffe/v2 v2.1.5