Merge pull request kubernetes#80362 from wojtek-t/cleanup_versioning_serializer

Cleanup versioning serializer

Author: k8s-ci-robot

staging/src/k8s.io/apimachinery/pkg/runtime/serializer/versioning/versioning.go

@@ -230,11 +230,3 @@ func (c *codec) Encode(obj runtime.Object, w io.Writer) error {
 	// Conversion is responsible for setting the proper group, version, and kind onto the outgoing object
 	return c.encoder.Encode(out, w)
 }
-
-// DirectEncoder was moved and renamed to runtime.WithVersionEncoder in 1.15.
-// TODO: remove in 1.16.
-type DirectEncoder = runtime.WithVersionEncoder
-
-// DirectDecoder was moved and renamed to runtime.WithoutVersionDecoder in 1.15.
-// TODO: remove in 1.16.
-type DirectDecoder = runtime.WithoutVersionDecoder