[VOL-4931] openoltAdapter: memory leak seen in long term tests

Change-Id: Ieb60bd9b4bdf88fc22a3b6704854591c0c30717d
diff --git a/go.mod b/go.mod
index de6b24b..fe0cc84 100644
--- a/go.mod
+++ b/go.mod
@@ -13,7 +13,7 @@
 	github.com/gogo/protobuf v1.3.2
 	github.com/golang/protobuf v1.5.2
 	github.com/grpc-ecosystem/go-grpc-middleware v1.3.0
-	github.com/opencord/voltha-lib-go/v7 v7.3.2
+	github.com/opencord/voltha-lib-go/v7 v7.4.1
 	github.com/opencord/voltha-protos/v5 v5.3.8
 	github.com/stretchr/testify v1.7.0
 	go.etcd.io/etcd v3.3.25+incompatible