VOL-4233: Update component version in voltha-helm-charts

Change-Id: I9558632f1cbc1fc426adcc4cfea00b3a764e47f7
diff --git a/VERSION b/VERSION
index 9781df7..834f262 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.8.0-dev
+2.8.0