build: upgrade vaadin dependency to 14.11.11

Author: javier-godoy

pom.xml

@@ -54,7 +54,7 @@
 	</licenses>
 
 	<properties>
-        <vaadin.version>14.9.8</vaadin.version>
+        <vaadin.version>14.11.11</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>