build(demo): update commons-demo to 3.8.0

Author: javier-godoy

pom.xml

@@ -139,7 +139,7 @@
 		<dependency>
 			<groupId>com.flowingcode.vaadin.addons.demo</groupId>
 			<artifactId>commons-demo</artifactId>
-			<version>3.7.1</version>
+			<version>3.8.0</version>
 			<scope>test</scope>
 		</dependency>
 		<dependency>