althonos/pronto: 2.4.1

Changed

• pronto.pv.PropertyValue is now an abstract class.
• pronto.parsers.RdfXmlParser now ignores synonym Xrefs not in the right format. ### Fixed
• pronto.Entity.definition documentation now lists return type as pronto.definition.Definition as expected.
• CURIE compaction in RDF/XML not being handled consistently, causing some crashes on ontologies using aliased relationships.
• pronto.utils.typechecked.disabled is now reentrant and should not be disabled in multithreaded contexts anymore. ### Removed
• Implicit injection of lxml instead of xml.etree, which caused issues with RdfXmlParser.