VOL-4028: Support fetching Onu PON Optical Information via SingleGetValueReq/Resp

Change-Id: I395aef64ee54ff75f172ac418ba73fcccd800f4f
diff --git a/vendor/modules.txt b/vendor/modules.txt
index cf2a0a7..acc38e3 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -77,7 +77,7 @@
 github.com/opencord/voltha-lib-go/v4/pkg/db
 github.com/opencord/voltha-lib-go/v4/pkg/db/kvstore
 github.com/opencord/voltha-lib-go/v4/pkg/log
-# github.com/opencord/voltha-protos/v4 v4.1.1
+# github.com/opencord/voltha-protos/v4 v4.1.4
 ## explicit
 github.com/opencord/voltha-protos/v4/go/common
 github.com/opencord/voltha-protos/v4/go/ext/config