[VOL-4223]: Release 2.9.3 version of voltha-go in preperation for voltha-2.8 release.
Also bump voltha-lib-go version to 5.0.5 (to be in sync with all other modules).

Change-Id: Ib19faa573402713c9cedcb6bdae120b09422bf6d
diff --git a/VERSION b/VERSION
index c95a470..4db4b03 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.9.3-dev
+2.9.3