Downgrade to the latest go-containerregistry tag that WGE can use

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• WGE uses helm which requires docker/docker v20.
• When building with v23 we get the error:
  • ../../go/pkg/mod/oras.land/oras-go@v1.2.2/pkg/auth/docker/login_tls.go:181:30: assignment mismatch: 3 variables but registry.PingV2Registry returns 2 values
• The most recent tag of go-containerregistry that uses docker v20 is v0.12.0:
  • https://github.com/google/go-containerregistry/commit/969699e7d1e6a55c5ac9316c61987085148d9932

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Seems to work better now see it in action on https://github.com/weaveworks/weave-gitops-enterprise/pull/2974