Bump sigs.k8s.io/kustomize/api from 0.6.3 to 0.6.4

Bumps [sigs.k8s.io/kustomize/api](https://github.com/kubernetes-sigs/kustomize) from 0.6.3 to 0.6.4.
- [Release notes](https://github.com/kubernetes-sigs/kustomize/releases)
- [Changelog](https://github.com/kubernetes-sigs/kustomize/blob/master/docs/v2.1.0_changelog.md)
- [Commits](kubernetes-sigs/kustomize@api/v0.6.3...api/v0.6.4)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

go.mod

@@ -22,6 +22,6 @@ require (
 	golang.org/x/crypto v0.0.0-20200214034016-1d94cc7ab1c6 // indirect
 	gopkg.in/ini.v1 v1.52.0 // indirect
 	k8s.io/client-go v0.17.3 // indirect
-	sigs.k8s.io/kustomize/api v0.6.3
+	sigs.k8s.io/kustomize/api v0.6.4
 	sigs.k8s.io/yaml v1.2.0
 )

go.sum

@@ -943,8 +943,10 @@ rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
 rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
 sigs.k8s.io/kustomize/api v0.6.3 h1:CX9Vot48rKRYZXzDkYJ7aJ4pEfjl8u7W8MPysbfYWps=
 sigs.k8s.io/kustomize/api v0.6.3/go.mod h1:mTwLqPB2uqh7LOcYoJKKHIfP5ioS6t3NfZ8lvia4NJY=
+sigs.k8s.io/kustomize/api v0.6.4/go.mod h1:BX11EGGdQTCYHLMaz7oT4TKdQ8owypNlYIrUj1i5HwA=
 sigs.k8s.io/kustomize/kyaml v0.9.1 h1:T7aNUraSioQp0NHJZtYjIhL/q8mqRzCiHcAKdvo09go=
 sigs.k8s.io/kustomize/kyaml v0.9.1/go.mod h1:UTm64bSWVdBUA8EQoYCxVOaBQxUdIOr5LKWxA4GNbkw=
+sigs.k8s.io/kustomize/kyaml v0.9.3/go.mod h1:UTm64bSWVdBUA8EQoYCxVOaBQxUdIOr5LKWxA4GNbkw=
 sigs.k8s.io/structured-merge-diff v0.0.0-20190525122527-15d366b2352e/go.mod h1:wWxsB5ozmmv/SG7nM11ayaAW51xMvak/t1r0CSlcokI=
 sigs.k8s.io/yaml v1.1.0 h1:4A07+ZFc2wgJwo8YNlQpr1rVlgUDlxXHhPJciaPY5gs=
 sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=