Update VPA version.go to 1.6.0 for release

Author: kamarabbas99

vertical-pod-autoscaler/common/version.go

@@ -21,7 +21,7 @@ package common
 var gitCommit = ""
 
 // versionCore is the version of VPA.
-const versionCore = "1.5.0"
+const versionCore = "1.6.0"
 
 // VerticalPodAutoscalerVersion returns the version of the VPA.
 func VerticalPodAutoscalerVersion() string {