Bump io.freefair.javadoc-links from 8.3 to 8.4

Bumps [io.freefair.javadoc-links](https://github.com/freefair/gradle-plugins) from 8.3 to 8.4.
- [Release notes](https://github.com/freefair/gradle-plugins/releases)
- [Commits](freefair/gradle-plugins@8.3...8.4)

---
updated-dependencies:
- dependency-name: io.freefair.javadoc-links
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

build.gradle.kts

@@ -7,7 +7,7 @@ plugins {
     id("org.cadixdev.licenser") version "0.6.1"
     id("com.github.gradle-git-version-calculator") version "1.1.0"
     id("io.freefair.lombok") version "8.3"
-    id("io.freefair.javadoc-links") version "8.3"
+    id("io.freefair.javadoc-links") version "8.4"
     id("io.freefair.javadoc-utf-8") version "8.3"
     id("org.sonarqube") version "4.4.1.3373"
 }