build: upgrade vaadin version to 14.11.13

Author: javier-godoy

pom.xml

@@ -9,7 +9,7 @@
 	<url>https://www.flowingcode.com/en/open-source/</url>
 
     <properties>
-        <vaadin.version>14.8.20</vaadin.version>
+        <vaadin.version>14.11.13</vaadin.version>
         <maven.compiler.source>1.8</maven.compiler.source>
         <maven.compiler.target>1.8</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>