Maven Central: fix deploy pipeline

[ChristianGruen]

OSSRH ist not available anymore:

mvn deploy
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-deploy-plugin:3.1.4:deploy (default-deploy) on project basex-parent: Failed to deploy artifacts: Could not transfer artifact org.basex:basex-parent:pom:12.3 from/to ossrh (https://oss.sonatype.org/service/local/staging/deploy/maven2/): Transfer failed for https://oss.sonatype.org/service/local/staging/deploy/maven2/org/basex/basex-parent/12.3/basex-parent-12.3.pom 402 Payment Required -> [Help 1]