Upgrade to Maven Site Plugin 3.8.2

Closes gh-18075

spring-boot-project/spring-boot-dependencies/pom.xml

@@ -233,7 +233,7 @@
 		<maven-javadoc-plugin.version>3.1.1</maven-javadoc-plugin.version>
 		<maven-resources-plugin.version>3.1.0</maven-resources-plugin.version>
 		<maven-shade-plugin.version>3.2.1</maven-shade-plugin.version>
-		<maven-site-plugin.version>3.7.1</maven-site-plugin.version>
+		<maven-site-plugin.version>3.8.2</maven-site-plugin.version>
 		<maven-source-plugin.version>3.1.0</maven-source-plugin.version>
 		<maven-surefire-plugin.version>2.22.2</maven-surefire-plugin.version>
 		<maven-war-plugin.version>3.2.3</maven-war-plugin.version>