Bump org.apache.maven.plugins:maven-compiler-plugin in /tests/java (#104)

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

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

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

Author: dependabot[bot]

tests/java/pom.xml

@@ -48,7 +48,7 @@
     <version.plugin.helidon-build-tools>2.0.0-M3</version.plugin.helidon-build-tools>
     <version.plugin.jib>3.4.0</version.plugin.jib>
     <version.plugin.maven.assembly>3.6.0</version.plugin.maven.assembly>
-    <version.plugin.maven.compiler>3.12.0</version.plugin.maven.compiler>
+    <version.plugin.maven.compiler>3.12.1</version.plugin.maven.compiler>
     <version.plugin.maven.dependency>3.6.1</version.plugin.maven.dependency>
     <version.plugin.maven.jar>3.3.0</version.plugin.maven.jar>
     <version.plugin.maven.shade>3.2.4</version.plugin.maven.shade>