Bump maven-site-plugin from 3.12.0 to 3.12.1 (#620)

Bumps [maven-site-plugin](https://github.com/apache/maven-site-plugin) from 3.12.0 to 3.12.1.
- [Release notes](https://github.com/apache/maven-site-plugin/releases)
- [Commits](apache/maven-site-plugin@maven-site-plugin-3.12.0...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-patch
...

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>

pom.xml

@@ -1012,7 +1012,7 @@
  <maven-release-plugin.version>2.5.3</maven-release-plugin.version>
  <maven-repository-plugin.version>2.4</maven-repository-plugin.version>
  <maven-resources-plugin.version>3.3.0</maven-resources-plugin.version>
- <maven-site-plugin.version>3.12.0</maven-site-plugin.version>
+ <maven-site-plugin.version>3.12.1</maven-site-plugin.version>
  <maven-source-plugin.version>3.2.1</maven-source-plugin.version>
  <!-- Stick with this version of surefire, see Java 5 comments above -->
  <maven-surefire-report-plugin.version>2.21.0</maven-surefire-report-plugin.version>