chore: update to log4j 2.16.0

build.xml

@@ -32,7 +32,9 @@
           <include name="eXist-db-*.tar.bz2"/>
           <exclude name="eXist-${project.processorversion}.tar.bz2"/>
       </delete>
-      <get src="https://github.com/eXist-db/exist/releases/download/eXist-${exist.version}/exist-distribution-${exist.version}-unix.tar.bz2" dest="${build.dir}/eXist-${exist.version}.tar.bz2" skipexisting="true" quiet="true" />
+      <!-- get src="https://github.com/eXist-db/exist/releases/download/eXist-${exist.version}/exist-distribution-${exist.version}-unix.tar.bz2" dest="${build.dir}/eXist-${exist.version}.tar.bz2" skipexisting="true" quiet="true" />
+      -->
+      <get src="https://gitlab.gwdg.de/sepia/existdb/-/package_files/1873/download" dest="${build.dir}/eXist-${exist.version}.tar.bz2" skipexisting="true" quiet="true" />
       <untar src="${build.dir}/eXist-${project.processorversion}.tar.bz2" dest="${test.dir}" compression="bzip2">
         <cutdirsmapper dirs="1" />
       </untar>