Update dependency org.apache.maven.plugins:maven-site-plugin to v3.12.1

Author: renovate[bot]

pom.xml

@@ -219,7 +219,7 @@
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>
 					<artifactId>maven-site-plugin</artifactId>
-					<version>3.8.2</version>
+					<version>3.12.1</version>
 				</plugin>
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>