build: update vaadin version to 14.8.11

Author: javier-godoy

pom.xml

@@ -9,7 +9,7 @@
     <description>Integration of paper-chip for Vaadin 14 as a field</description>
 
     <properties>
-        <vaadin.version>14.6.2</vaadin.version>
+        <vaadin.version>14.8.11</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>