Bump maven-site-plugin from 3.11.0 to 3.12.0

Author: dependabot[bot]

pom.xml

@@ -144,7 +144,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-site-plugin</artifactId>
-        <version>3.11.0</version>
+        <version>3.12.0</version>
       </plugin>
     </plugins>
   </build>