chore(deps): update dependency org.apache.maven.plugins:maven-site-pl…

…ugin to v3.21.0 (#536)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

element-template-generation/pom.xml

@@ -125,7 +125,7 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-site-plugin</artifactId>
-          <version>3.20.0</version>
+          <version>3.21.0</version>
         </plugin>
         <plugin>
           <groupId>com.diffplug.spotless</groupId>