Add gopkg.in/yaml.v2 to hack/unwanted-dependencies.json

Author: jpbetz

hack/unwanted-dependencies.json

@@ -71,6 +71,7 @@
       "google.golang.org/appengine": "cloud dependency",
       "google.golang.org/genproto": "refer to #113366",
       "gopkg.in/fsnotify.v1": "obsolete, use github.com/fsnotify/fsnotify",
+      "gopkg.in/yaml.v2": "prefer sigs.k8s.io/yaml",
       "k8s.io/klog": "we have switched to klog v2, so avoid klog v1",
       "rsc.io/quote": "refer to #102833",
       "rsc.io/sampler": "refer to #102833",
@@ -234,6 +235,14 @@
         "go.etcd.io/etcd/api/v3",
         "go.etcd.io/etcd/client/v3",
         "go.etcd.io/etcd/server/v3"
+      ],
+      "gopkg.in/yaml.v2": [
+        "github.com/grpc-ecosystem/grpc-gateway",
+        "github.com/prometheus/client_golang",
+        "github.com/prometheus/common",
+        "go.etcd.io/etcd/api/v3",
+        "go.etcd.io/etcd/client/v3",
+        "go.etcd.io/etcd/server/v3"
       ]
     },
     "unwantedVendored": [