Bump maven-site-plugin from 3.11.0 to 3.12.1 (#3558)

Bumps [maven-site-plugin](https://github.com/apache/maven-site-plugin) from 3.11.0 to 3.12.1.
- [Release notes](https://github.com/apache/maven-site-plugin/releases)
- [Commits](apache/maven-site-plugin@maven-site-plugin-3.11.0...maven-site-plugin-3.12.1)

---
updated-dependencies:
- dependency-name: org.apache.maven.plugins:maven-site-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pom.xml

@@ -593,7 +593,7 @@
     <maven-install-plugin-version>3.0.1</maven-install-plugin-version>
     <maven-jar-plugin-version>3.3.0</maven-jar-plugin-version>
     <maven-resources-plugin-version>3.2.0</maven-resources-plugin-version>
-    <maven-site-plugin-version>3.11.0</maven-site-plugin-version>
+    <maven-site-plugin-version>3.12.1</maven-site-plugin-version>
     <maven-surefire-plugin-version>3.0.0-M7</maven-surefire-plugin-version>
     <maven-checkstyle-plugin-version>3.2.0</maven-checkstyle-plugin-version>
     <maven-release-plugin-version>3.0.0-M5</maven-release-plugin-version>