Bump org.codehaus.mojo:buildnumber-maven-plugin from 3.3.0 to 3.3.1 - #109

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: whelk-io/maven-settings-xml-action@v22. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/