Update go-openapi dependencies (jsonpointer, jsonreference, swag)

Bump go-openapi dependencies to latest versions:
- github.com/go-openapi/jsonpointer v0.21.0 → v0.22.4
- github.com/go-openapi/jsonreference v0.20.2 → v0.21.4
- github.com/go-openapi/swag v0.23.0 → v0.25.4

The new swag version has been restructured into a multi-module monorepo
with submodules (cmdutils, conv, fileutils, jsonname, jsonutils, loading,
mangling, netutils, stringutils, typeutils, yamlutils). As a result:
- mailru/easyjson and josharian/intern are no longer transitive deps
  and have been removed from vendor
- go-openapi/jsonpointer and go-openapi/swag no longer reference
  unwanted deps davecgh/go-spew, mailru/easyjson, or gopkg.in/yaml.v3
- Updated hack/unwanted-dependencies.json accordingly

Signed-off-by: Davanum Srinivas <davanum@gmail.com>

Kubernetes-commit: 693dc57f5753ce69f7d3f49f26bfefc9554e47e6