Bump maven-site-plugin from 3.7.1 to 3.8.2 (#2858)

Bumps [maven-site-plugin](https://github.com/apache/maven-site-plugin) from 3.7.1 to 3.8.2.
- [Release notes](https://github.com/apache/maven-site-plugin/releases)
- [Commits](apache/maven-site-plugin@maven-site-plugin-3.7.1...maven-site-plugin-3.8.2)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

dropwizard-example/pom.xml

@@ -188,7 +188,7 @@
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-site-plugin</artifactId>
-                    <version>3.7.1</version>
+                    <version>3.8.2</version>
                 </plugin>
             </plugins>
         </pluginManagement>

pom.xml

@@ -574,7 +574,7 @@
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-site-plugin</artifactId>
-                    <version>3.7.1</version>
+                    <version>3.8.2</version>
                 </plugin>
                 <plugin>
                     <groupId>org.eluder.coveralls</groupId>