[VOL-3318] : Framework for collecting Metrics from the ONU
- Currently implements collecting of OpticalPower Metrics and UNI status metrics
- Supports changing Metric collection frequency
- Use voltha-lib-go version 4.0.6

Change-Id: I9bd1ec8d8af9d739db96ae0303b6702dd3ce8520
diff --git a/go.mod b/go.mod
index 6c99589..82b9486 100644
--- a/go.mod
+++ b/go.mod
@@ -9,7 +9,7 @@
 	github.com/google/gopacket v1.1.17
 	github.com/looplab/fsm v0.1.0
 	github.com/opencord/omci-lib-go v0.13.4
-	github.com/opencord/voltha-lib-go/v4 v4.0.5
+	github.com/opencord/voltha-lib-go/v4 v4.0.6
 	github.com/opencord/voltha-protos/v4 v4.0.8
 	github.com/stretchr/testify v1.6.1
 	google.golang.org/grpc v1.25.1 // indirect