Bump org.cip4.lib.jdf:JDFLibJ from 2.1.7.+ to 2.1.8.4

Bumps [org.cip4.lib.jdf:JDFLibJ](https://github.com/cip4/JDFLibJ) from 2.1.7.+ to 2.1.8.4.
- [Release notes](https://github.com/cip4/JDFLibJ/releases)
- [Commits](https://github.com/cip4/JDFLibJ/commits/2.1.8.4)

---
updated-dependencies:
- dependency-name: org.cip4.lib.jdf:JDFLibJ
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

build.gradle

@@ -55,7 +55,7 @@ dependencies {
     implementation 'org.springframework.boot:spring-boot-starter-web'
     implementation 'org.codehaus.groovy:groovy:+'
     implementation 'org.codehaus.groovy:groovy-xml:+'
-    implementation 'org.cip4.lib.jdf:JDFLibJ:2.1.7.+'
+    implementation 'org.cip4.lib.jdf:JDFLibJ:2.1.8.+'
     implementation 'com.formdev:flatlaf:3.+'
 
     implementation 'org.xhtmlrenderer:core-renderer:R8'