chore(deps): update dependency org.apache.maven.plugins:maven-site-plugin to v3.21.0

Author: renovate[bot]

pom.xml

@@ -47,7 +47,7 @@
     <plugin.version.maven-compiler-plugin>3.14.1</plugin.version.maven-compiler-plugin>
     <plugin.version.native-maven-plugin>0.10.6</plugin.version.native-maven-plugin>
     <plugin.version.maven-depdendency-plugin>3.9.0</plugin.version.maven-depdendency-plugin>
-    <plugin.version.maven-site-plugin>3.20.0</plugin.version.maven-site-plugin>
+    <plugin.version.maven-site-plugin>3.21.0</plugin.version.maven-site-plugin>
     <plugin.version.maven-assembly-plugin>3.7.1</plugin.version.maven-assembly-plugin>
     <plugin.version.maven-release-plugin>3.1.1</plugin.version.maven-release-plugin>
     <plugin.version.frontend-maven-plugin>1.15.4</plugin.version.frontend-maven-plugin>