renovate: enable automerge for pin/pinDigest and patch

[mtardy]

Let's agree on what it's reasonable to enable auto-merge! I propose:

   {
      "matchPackageNames": [
        "go", // golang version directive upgrade in go.mod
      ],
      "matchPackagePrefixes": [
        "docker.io/library/", // official Docker images
        "github.com/golang/", // Golang official org
        "golang.org/x/", // Golang official experimental org
        "google.golang.org/", // Google official repo for api/genproto/grpc/protobuf
        "github.com/google/", // Google official github org
        "k8s.io/", // Kubernetes official repo
        "sigs.k8s.io/", // Kubernetes official SIG repo
      ],
      "matchUpdateTypes": [
        "patch",
        "pin",
        "pinDigest"
      ],
      "automerge": true
    },

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