Bump up omec user plane chart version

Bump up omec user plane chart version to keep room for
Aether 1.6.x related changes

Change-Id: I01860027d0baeab2583ab846d979bc56ed67e22a
diff --git a/omec/omec-user-plane/Chart.yaml b/omec/omec-user-plane/Chart.yaml
index b3982fe..6930160 100644
--- a/omec/omec-user-plane/Chart.yaml
+++ b/omec/omec-user-plane/Chart.yaml
@@ -7,4 +7,4 @@
 name: omec-user-plane
 icon: https://guide.opencord.org/logos/cord.svg
 
-version: 0.5.4
+version: 0.6.0