Missing source and javadoc artifacts on Maven Central for xmpcore 6.1.11

### Expected Behaviour
- Each version of xmpcore published on Maven Central should contain source and javadoc artifacts

### Actual Behaviour
- OK for version 6.1.10: https://repo1.maven.org/maven2/com/adobe/xmp/xmpcore/6.1.10/
- KO for version 6.1.11: https://repo1.maven.org/maven2/com/adobe/xmp/xmpcore/6.1.11/

Context: we're collecting the sources of our transitive dependencies, see https://josm.openstreetmap.de/ticket/21140#comment:7

Compare the Maven Central directories for xmpcore 6.1.10 and 6.1.11, then trace the project’s release or publication entry point that produces these artifacts. Done means the 6.1.11 release includes both source and javadoc artifacts like 6.1.10.

Written by the indexing model from the issue text.