[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/vendor/modules.txt b/vendor/modules.txt
index 2d33169..d0ec634 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -74,7 +74,7 @@
 # github.com/opencord/omci-lib-go v0.13.4
 github.com/opencord/omci-lib-go
 github.com/opencord/omci-lib-go/generated
-# github.com/opencord/voltha-lib-go/v4 v4.0.5
+# github.com/opencord/voltha-lib-go/v4 v4.0.6
 github.com/opencord/voltha-lib-go/v4/pkg/adapters
 github.com/opencord/voltha-lib-go/v4/pkg/adapters/adapterif
 github.com/opencord/voltha-lib-go/v4/pkg/adapters/common