Kustomize: namePrefix applies to literally declared Namespace

[klst9498]

Describe the bug
If a Kustomize.yaml file does contain a "namePrefix:" the prefix is also applied to the name of Namespace yaml file. This is an issue of Kustomize VERSION=3.7.0.
see also: kubernetes-sigs/kustomize#235

To Reproduce
explained in kubernetes-sigs/kustomize#235 too

Expected behavior
namePrefix i not applied to the name of an Namespace file

** Solution:
+++ b/docker/kustomize.version
@@ -1,2 +1,2 @@
-KUSTOMIZE_VERSION=3.7.0
-KUSTOMIZE_CHECKSUM=7cfdfd9699d9ca3cfd076b6a70d2be389dfe3f55691801cc617883cef351c52c
+KUSTOMIZE_VERSION=3.8.4
+KUSTOMIZE_CHECKSUM=194caffbdb59d8fc887488ba8fa3dce7b68ccf816737b57bde7338ca980f4912