Update dependency org.xhtmlrenderer:flying-saucer-pdf-openpdf to v9.4.0

Author: renovate[bot]

gradle.properties

@@ -62,7 +62,7 @@ testingSupportVersionForTests=4.0.0-SNAPSHOT
 tomcatLog4jVersion=8.5.2
 tomcatVersion=10.1.31
 viewsVersion=4.0.0-SNAPSHOT
-xhtmlRendererVersion=9.1.22
+xhtmlRendererVersion=9.4.0
 org.gradle.caching=true
 org.gradle.parallel=true
 org.gradle.daemon=true