Update Javadocs artifact upload path to include all files in the directory

Author: SableRaf

.github/workflows/build-and-deploy-javadoc.yml

@@ -82,7 +82,7 @@ jobs:
     - name: Upload Javadocs artifact
       uses: actions/upload-pages-artifact@v1
       with:
-        path: processing4/build/javadoc/core
+        path: processing4/build/javadoc/core/**
 
     - name: Clean up the processing4 directory
       run: |