VOL-3082: Update go mod to voltha-lib-go version 3.1.11

Change-Id: I1593e5750aa0773eb8440153134dfb6db29ab007
diff --git a/VERSION b/VERSION
index 7bf4b6a..8c78496 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.4.6
+2.4.7-dev