Bump modernizer-maven-plugin.version from 2.9.0 to 3.1.0

Bumps `modernizer-maven-plugin.version` from 2.9.0 to 3.1.0.

Updates `org.gaul:modernizer-maven-annotations` from 2.9.0 to 3.1.0
- [Release notes](https://github.com/gaul/modernizer-maven-plugin/releases)
- [Commits](gaul/modernizer-maven-plugin@modernizer-maven-plugin-2.9.0...modernizer-maven-plugin-3.1.0)

Updates `org.gaul:modernizer-maven-plugin` from 2.9.0 to 3.1.0
- [Release notes](https://github.com/gaul/modernizer-maven-plugin/releases)
- [Commits](gaul/modernizer-maven-plugin@modernizer-maven-plugin-2.9.0...modernizer-maven-plugin-3.1.0)

---
updated-dependencies:
- dependency-name: org.gaul:modernizer-maven-annotations
  dependency-type: direct:development
  update-type: version-update:semver-major
- dependency-name: org.gaul:modernizer-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

pom.xml

@@ -125,7 +125,7 @@
         <maven-jxr-plugin.version>3.6.0</maven-jxr-plugin.version>
         <maven-javadoc-plugin.version>3.11.2</maven-javadoc-plugin.version>
         <taglist-maven-plugin.version>3.2.1</taglist-maven-plugin.version>
-        <modernizer-maven-plugin.version>2.9.0</modernizer-maven-plugin.version>
+        <modernizer-maven-plugin.version>3.1.0</modernizer-maven-plugin.version>
         <!-- deze property wordt gebruikt om tijdens tests te bepalen of we met een geupgraded
         release database werken of een ontwikkel versie -->
         <database.upgrade />