Update billing.version from 2.3.0-SNAPSHOT to 2.3.0 (#1037)

Author: wikumChamith

distro/pom.xml

@@ -54,7 +54,7 @@
     <bedmanagement.version>7.2.0</bedmanagement.version>
     <!-- Stock Management and Billing -->
     <stockmanagement.version>3.0.0</stockmanagement.version>
-    <billing.version>2.3.0-SNAPSHOT</billing.version>
+    <billing.version>2.3.0</billing.version>
     <tasks.version>2.1.0</tasks.version>
     <!-- Content Packages -->
     <reference-content.version>1.4.0</reference-content.version>