removed platform-services-go-sdk replace from go.mod (IBM-Cloud#6495)

Author: uibm

go.mod

@@ -232,8 +232,6 @@ replace github.com/hashicorp/vault => github.com/hashicorp/vault v1.18.2
 
 replace github.com/hashicorp/vault/api/auth/approle => github.com/hashicorp/vault/api/auth/approle v0.8.0
 
-replace github.com/IBM/platform-services-go-sdk v0.86.0 => ../platform-services-go-sdk
-
 exclude (
 	github.com/kubernetes-incubator/external-storage v0.0.0-00010101000000-000000000000
 	github.com/kubernetes-incubator/external-storage v0.20.4-openstorage-rc2