Fixing GitHub workflow for JavaDoc building

Author: RedstoneFuture

.github/workflows/publish-javadoc.yml

@@ -22,7 +22,7 @@ jobs:
         uses: actions/setup-java@v4
         with:
           distribution: temurin
-          java-version: 17
+          java-version: 21
 
       - name: Build Javadoc
         run: mvn javadoc:javadoc