Fix GraalVM build

Author: atextor

tools/samm-cli/src/main/resources/META-INF/native-image/org.eclipse.esmf/samm-cli/native-image.properties

@@ -56,6 +56,7 @@ Args = -H:EnableURLProtocols=http,https \
        --initialize-at-build-time=org.apache.jena.ext.xerces.impl.xpath.regex.Token$ParenToken \
        --initialize-at-build-time=org.apache.jena.ext.xerces.impl.xpath.regex.Token$UnionToken \
        --initialize-at-build-time=org.apache.jena.ext.xerces.util.XMLChar \
+       --initialize-at-build-time=org.apache.jena.ext.xerces.util.XercesXMLChar \
        --initialize-at-build-time=org.jcodings.spi.ISO_8859_16 \
        --initialize-at-build-time=org.slf4j.LoggerFactory \
        --initialize-at-build-time=org.slf4j.impl.SimpleLogger \