Bump maven-compiler-plugin from 3.6.1 to 3.9.0 (#118)

Bumps [maven-compiler-plugin](https://github.com/apache/maven-compiler-plugin) from 3.6.1 to 3.9.0.
- [Release notes](https://github.com/apache/maven-compiler-plugin/releases)
- [Commits](apache/maven-compiler-plugin@maven-compiler-plugin-3.6.1...maven-compiler-plugin-3.9.0)

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

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

pom.xml

@@ -224,7 +224,7 @@
         <jdbc.postgres.version>42.2.2</jdbc.postgres.version>
         <docker.maven.plugin.version>0.25.2</docker.maven.plugin.version>
         <scala.maven.plugin.version>4.5.6</scala.maven.plugin.version>
-        <maven.compiler.plugin.version>3.6.1</maven.compiler.plugin.version>
+        <maven.compiler.plugin.version>3.9.0</maven.compiler.plugin.version>
         <scalatest.maven.plugin.version>2.0.2</scalatest.maven.plugin.version>
         <maven.jar.plugin.version>3.2.0</maven.jar.plugin.version>
         <maven.source.plugin.version>3.2.1</maven.source.plugin.version>