Update maven fluido skin to 1.9 and site-plugin to 3.9.1
diff --git a/pom.xml b/pom.xml
index d563aaa..11af3d7 100644
--- a/pom.xml
+++ b/pom.xml
@@ -32,7 +32,7 @@
     <dependency>
       <groupId>org.apache.maven.skins</groupId>
       <artifactId>maven-fluido-skin</artifactId>
-      <version>1.3.1</version>
+      <version>1.9</version>
     </dependency>
     <dependency>
       <groupId>org.apache.rat</groupId>
@@ -193,7 +193,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-site-plugin</artifactId>
-        <version>3.7</version>
+        <version>3.9.1</version>
         <configuration>
           <outputEncoding>${project.build.sourceEncoding}</outputEncoding>
           <inputEncoding>${project.build.sourceEncoding}</inputEncoding>
diff --git a/src/site/site.xml b/src/site/site.xml
index 4d493b6..f5fe059 100644
--- a/src/site/site.xml
+++ b/src/site/site.xml
@@ -2,7 +2,7 @@
   <skin>
     <groupId>org.apache.maven.skins</groupId>
     <artifactId>maven-fluido-skin</artifactId>
-    <version>1.3.1</version>
+    <version>1.9</version>
   </skin>
 
   <custom>