HADOOP-17551. Upgrade maven-site-plugin to 3.11.0 (#4196)

Reviewed-by: Ayush Saxena <ayushsaxena@apache.org>
Signed-off-by: Akira Ajisaka <aajisaka@apache.org>
(cherry picked from commit 56cfd6061770872ce35cf815544b0c0f49613209)

pom.xml

@@ -95,7 +95,7 @@ xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/x
 
     <!-- maven plugin versions -->
     <maven-deploy-plugin.version>2.8.1</maven-deploy-plugin.version>
-    <maven-site-plugin.version>3.6</maven-site-plugin.version>
+    <maven-site-plugin.version>3.11.0</maven-site-plugin.version>
     <maven-stylus-skin.version>1.5</maven-stylus-skin.version>
     <maven-antrun-plugin.version>1.7</maven-antrun-plugin.version>
     <maven-assembly-plugin.version>2.4</maven-assembly-plugin.version>
@@ -219,11 +219,6 @@ xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/x
               <artifactId>wagon-ssh</artifactId>
               <version>${wagon-ssh.version}</version>
             </dependency>
-            <dependency>
-              <groupId>org.apache.maven.doxia</groupId>
-              <artifactId>doxia-module-markdown</artifactId>
-              <version>1.8</version>
-            </dependency>
           </dependencies>
         </plugin>
         <!--This plugin's configuration is used to store Eclipse m2e settings only.