[VOL-5245] -- post-release patch

VERSION
go.mod
go.sum
vendor/modules.txt
------------------
  o Update voltha-protos (version:v5.5.0) for branch=master.

Change-Id: I4641543d18918ff42cd579435e918828df2cf1d5
diff --git a/VERSION b/VERSION
index 0be83e5..93c8dda 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-7.6.0-dev
+7.6.0