[VOL-5429] - update voltha-lib-go version to 7.6.6

Change-Id: Icfb05034b265fb758603234764e624c95c5b2762
Signed-off-by: Sridhar Ravindra <sridhar.ravindra@radisys.com>
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 469babc..abc812b 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -153,7 +153,7 @@
 github.com/opencord/omci-lib-go/v2
 github.com/opencord/omci-lib-go/v2/generated
 github.com/opencord/omci-lib-go/v2/meframe
-# github.com/opencord/voltha-lib-go/v7 v7.6.5
+# github.com/opencord/voltha-lib-go/v7 v7.6.6
 ## explicit
 github.com/opencord/voltha-lib-go/v7/pkg/config
 github.com/opencord/voltha-lib-go/v7/pkg/db